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Stage 2 was trained on ground-truth stage-1 outcomes but deployed on
sampled ones, and in a rollout that gap compounds over every step of
every track — the same train/inference gap teacher_forcing="scheduled"
already closes within stage 2, just never applied at the stage
boundary. "sampled" was declared in the schema but rejected loudly by
validate_config as unimplemented; this lands the real implementation.
Mirrors the existing scheduled-sampling precedent rather than a hard
switch: new stage2_model.ctx_p_start/ctx_p_end (defaults 1.0 -> 0.0)
linearly ramp P(condition on ground truth) from epoch 0 to the final
epoch, so stage 2 doesn't chase a wildly moving stage-1 target early in
training. Per the plan discussed with the user: the sample is drawn
from stage 1's sampling_model() (EMA weights when present, matching
what inference actually deploys), mixed per example via a Bernoulli
draw (never blended within a row), and validation always uses the
ground truth regardless of the schedule. Fixes a latent bug the same
pattern would otherwise have hit: every sampler in giant/sample.py
flips its model to .eval() with no restore, so sampling from the raw
(non-EMA) stage-1 model mid-step now explicitly restores its .training
flag afterward to avoid silently corrupting stage 1's own training mode
for the rest of the epoch.
validate_config now enforces stage1_context in {"truth", "sampled"},
requires both stages active for "sampled" (nothing to sample from
otherwise), range-checks ctx_p_start/ctx_p_end, and rejects the
ctx_p_start = ctx_p_end = 1.0 configuration as an unadvertised no-op
identical to "truth".
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
959 lines
37 KiB
Python
959 lines
37 KiB
Python
"""Tests for giant/training/."""
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import copy
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import csv
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import math
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import tempfile
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from pathlib import Path
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from unittest.mock import MagicMock, patch
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import pytest
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import torch
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from giant.config import ParticleTypeConfig
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from giant.constants import (
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COND_DIM,
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CONT_SLOT_DIM,
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K_MAX,
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PARTICLE_PHYS_DIM,
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SEC_SLOT_DIM,
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X_DIM,
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)
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from giant.data.dataset import StepBatch
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from giant.model.network import Stage2Autoregressive, build_critics, build_models
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from giant.sample import sample_stage1 as trainers_sample_stage1
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from giant.training import (
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FlowDDPMStageTrainer,
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StageSpec,
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WGANStageTrainer,
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build_stage_trainers,
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train,
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)
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from giant.training.metrics import _wandb_run_config
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from giant.training.stage2_inputs import (
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_ar_has_prev,
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_assemble_stage2_ar_inputs,
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_assemble_stage2_ar_target,
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_assemble_stage2_real,
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_gumbel_tau,
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_relax_onehot_type_slice,
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_remaining_energy_fraction,
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_shift_prev,
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_stage2_tf_prob,
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_stick_fraction,
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_stop_target_and_mask,
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_type_repr,
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)
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PDG_VOCAB = 6
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MAT_VOCAB = 3
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def test_gumbel_tau_at_step_zero_is_start():
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assert _gumbel_tau(0, 1000, 1.0, 0.1) == 1.0
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def test_gumbel_tau_at_total_steps_is_end():
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assert abs(_gumbel_tau(1000, 1000, 1.0, 0.1) - 0.1) < 1e-9
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def test_gumbel_tau_interpolates_linearly_midway():
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assert abs(_gumbel_tau(500, 1000, 1.0, 0.1) - 0.55) < 1e-9
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def test_gumbel_tau_clamps_beyond_total_steps():
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assert _gumbel_tau(5000, 1000, 1.0, 0.1) == _gumbel_tau(1000, 1000, 1.0, 0.1)
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def test_gumbel_tau_handles_zero_total_steps():
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# total_steps=0 is guarded to 1 internally: step=0 gives zero progress
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# (still tau_start), any step>=1 immediately clamps to full progress.
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assert _gumbel_tau(0, 0, 1.0, 0.1) == 1.0
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assert abs(_gumbel_tau(1, 0, 1.0, 0.1) - 0.1) < 1e-9
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def test_wandb_run_config_includes_full_cfg_and_param_counts():
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cfg = {
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"train": {"lr": 3e-4},
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"conditioning": {"out_dim": 128},
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"stage1_model": {"generator": "flow"},
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"stage2_model": {"generator": "wgan"},
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}
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wcfg = _wandb_run_config(cfg, model_config={"pdg_vocab": 3}, param_counts={"stage1": 100})
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assert wcfg["train"] == {"lr": 3e-4}
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assert wcfg["stage1_model"] == {"generator": "flow"}
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assert wcfg["stage2_model"] == {"generator": "wgan"}
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assert wcfg["model_config"] == {"pdg_vocab": 3}
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assert wcfg["param_counts"] == {"stage1": 100}
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def test_wandb_run_config_handles_missing_model_config():
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cfg = {"train": {}, "conditioning": {}, "stage1_model": {}, "stage2_model": {}}
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wcfg = _wandb_run_config(cfg, model_config=None, param_counts={})
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assert wcfg["model_config"] == {}
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# --- AR helper functions (v0.3.0 step 5) ---------
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def test_stick_fraction_matches_sigmoid_of_logit():
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sec_cont = torch.zeros(2, 3, SEC_SLOT_DIM)
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sec_cont[..., 0] = torch.tensor([[0.0, 2.0, -2.0], [1.0, -1.0, 0.0]])
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frac = _stick_fraction(sec_cont)
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assert torch.allclose(frac, torch.sigmoid(sec_cont[..., 0]))
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def test_remaining_energy_fraction_hand_computed():
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fraction = torch.tensor([[0.5, 0.5, 1.0]])
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remaining = _remaining_energy_fraction(fraction)
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assert torch.allclose(remaining, torch.tensor([[1.0, 0.5, 0.25]]))
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def test_shift_prev_shifts_and_zero_pads_slot0():
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x = torch.arange(2 * 4 * 3).reshape(2, 4, 3).float()
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shifted = _shift_prev(x)
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assert torch.all(shifted[:, 0] == 0)
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assert torch.equal(shifted[:, 1:], x[:, :-1])
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def test_ar_has_prev_false_only_at_slot_zero():
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has_prev = _ar_has_prev(5, torch.device("cpu"))
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assert has_prev.shape == (1, 5)
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assert has_prev.tolist() == [[False, True, True, True, True]]
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def test_stop_target_and_mask_hand_computed():
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# k_max=5; n_sec=0 (no real secondaries, stop slot is 0), n_sec=2
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# (stop slot is 2), n_sec=5 (== k_max: no in-range stop slot at all).
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n_sec = torch.tensor([0, 2, 5])
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target, mask = _stop_target_and_mask(n_sec, 5, torch.device("cpu"))
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assert target.tolist() == [
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[1, 0, 0, 0, 0],
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[0, 0, 1, 0, 0],
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[0, 0, 0, 0, 0],
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]
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assert mask.tolist() == [
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[True, False, False, False, False],
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[True, True, True, False, False],
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[True, True, True, True, True],
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]
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# --- _stage2_tf_prob (v0.3.0 step 7) -----------
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def test_stage2_tf_prob_always_is_constant_one():
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assert _stage2_tf_prob("always", 1.0, 0.0, 0, 10) == 1.0
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assert _stage2_tf_prob("always", 1.0, 0.0, 9, 10) == 1.0
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def test_stage2_tf_prob_never_is_constant_zero():
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assert _stage2_tf_prob("never", 1.0, 1.0, 0, 10) == 0.0
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assert _stage2_tf_prob("never", 1.0, 1.0, 9, 10) == 0.0
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def test_stage2_tf_prob_scheduled_interpolates_linearly():
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assert _stage2_tf_prob("scheduled", 1.0, 0.0, 0, 11) == 1.0
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assert abs(_stage2_tf_prob("scheduled", 1.0, 0.0, 5, 11) - 0.5) < 1e-9
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assert _stage2_tf_prob("scheduled", 1.0, 0.0, 10, 11) == 0.0
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def test_stage2_tf_prob_scheduled_clamps_beyond_total_epochs():
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end = _stage2_tf_prob("scheduled", 1.0, 0.0, 10, 11)
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beyond = _stage2_tf_prob("scheduled", 1.0, 0.0, 50, 11)
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assert beyond == end
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def test_stage2_tf_prob_scheduled_handles_single_epoch():
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# total_epochs=1 is guarded to a denominator of 1 internally (like
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# _gumbel_tau's total_steps=0 guard) — epoch=0 gives zero progress.
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assert _stage2_tf_prob("scheduled", 1.0, 0.0, 0, 1) == 1.0
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@pytest.mark.parametrize("target", ["physical", "onehot", "embedding"])
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def test_type_repr_shapes_and_values(target):
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B, K, emb_dim = 3, 4, 6
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sec_cont = torch.randn(B, K, SEC_SLOT_DIM)
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sec_type_idx = torch.randint(0, emb_dim, (B, K))
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cond_enc = torch.nn.Module()
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if target == "embedding":
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cond_enc.pdg_emb = torch.nn.Embedding(emb_dim, emb_dim)
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repr_ = _type_repr(sec_type_idx, sec_cont, ParticleTypeConfig(target=target), cond_enc, emb_dim)
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expected_width = PARTICLE_PHYS_DIM if target == "physical" else emb_dim
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assert repr_.shape == (B, K, expected_width)
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if target == "physical":
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assert torch.equal(repr_, sec_cont[..., CONT_SLOT_DIM : CONT_SLOT_DIM + PARTICLE_PHYS_DIM])
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if target == "onehot":
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assert torch.all(repr_.sum(-1) == 1.0)
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@pytest.mark.parametrize(
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"target,generator",
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[
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("physical", "flow"),
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("physical", "wgan"),
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("onehot", "flow"),
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("onehot", "wgan"),
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("embedding", "flow"),
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("embedding", "wgan"),
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],
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)
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def test_assemble_stage2_ar_target_matches_assemble_stage2_real_flattened(target, generator):
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"""Regression test tying the refactor together: _assemble_stage2_real is
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now defined as _assemble_stage2_ar_target(...).flatten(1)."""
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B, emb_dim = 4, 6
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sec_cont = torch.randn(B, K_MAX, SEC_SLOT_DIM)
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sec_type_idx = torch.randint(0, emb_dim, (B, K_MAX))
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cond_enc = torch.nn.Module()
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if target == "embedding":
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cond_enc.pdg_emb = torch.nn.Embedding(emb_dim, emb_dim)
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particle_type_cfg = ParticleTypeConfig(target=target)
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flat = _assemble_stage2_real(sec_cont, sec_type_idx, particle_type_cfg, generator, cond_enc, emb_dim)
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unflat = _assemble_stage2_ar_target(sec_cont, sec_type_idx, particle_type_cfg, generator, cond_enc, emb_dim)
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assert torch.equal(unflat.flatten(1), flat)
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def test_assemble_stage2_ar_inputs_shapes_and_history_feat_width():
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B, emb_dim = 3, 6
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sec_cont = torch.randn(B, K_MAX, SEC_SLOT_DIM)
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sec_type_idx = torch.randint(0, emb_dim, (B, K_MAX))
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cond_enc = torch.nn.Module()
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out = _assemble_stage2_ar_inputs(sec_cont, sec_type_idx, ParticleTypeConfig(target="physical"), cond_enc, emb_dim)
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assert out["history_feat"].shape == (B, K_MAX, CONT_SLOT_DIM + PARTICLE_PHYS_DIM)
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assert out["has_prev"].shape == (B, K_MAX)
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assert out["remaining_frac"].shape == (B, K_MAX)
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assert out["slot_idx"].shape == (B, K_MAX)
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assert torch.all(out["slot_idx"][:, 0] == 0.0)
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assert torch.all(out["slot_idx"][:, -1] == 1.0)
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def test_relax_onehot_type_slice_grad_probe_populates_both_norms():
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B, k_max, cont_dim, type_dim = 4, K_MAX, CONT_SLOT_DIM, 6
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x_flat = torch.randn(B, k_max * (cont_dim + type_dim), requires_grad=True)
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grad_probe: dict[str, float] = {}
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out = _relax_onehot_type_slice(x_flat, k_max, cont_dim, type_dim, tau=0.5, grad_probe=grad_probe)
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out.sum().backward()
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assert grad_probe["cont"] >= 0.0
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assert grad_probe["type"] >= 0.0
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def test_relax_onehot_type_slice_grad_probe_none_is_backward_compatible():
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B, k_max, cont_dim, type_dim = 4, K_MAX, CONT_SLOT_DIM, 6
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x_flat = torch.randn(B, k_max * (cont_dim + type_dim), requires_grad=True)
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out = _relax_onehot_type_slice(x_flat, k_max, cont_dim, type_dim, tau=0.5)
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out.sum().backward()
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assert x_flat.grad is not None
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# --- end-to-end train() integration tests -----------------------------------
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PARTICLE_CFG = {"type": "physical", "emb_dim": 8, "n_layers": 1}
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MATERIAL_CFG = {"type": "physical", "emb_dim": 8, "n_layers": 1}
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def _base_cfg():
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return {
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"conditioning": {
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"out_dim": 32,
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"share_stages": False,
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"particle": dict(PARTICLE_CFG),
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"material": dict(MATERIAL_CFG),
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},
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"stage1_model": {
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"active": True,
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"generator": "flow",
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"hidden_dim": 24,
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"n_res_blocks": 2,
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"dropout": 0.0,
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"lambda": 1.0,
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"flow": {"time_dim": 16},
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"ddpm": {"time_dim": 16, "n_steps": 50},
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"wgan": {
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"noise_dim": 16,
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"n_critic": 2,
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"gp_weight": 10.0,
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"critic_lr": 0.0,
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},
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"router": {"enabled": False},
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},
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"stage2_model": {
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"active": True,
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"decoder": "one_shot",
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"generator": "wgan",
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"hidden_dim": 24,
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"n_res_blocks": 2,
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"dropout": 0.0,
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"lambda": 1.0,
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"k_max": K_MAX,
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"context_dim": 16,
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"n_sec": {"mode": "head", "lambda": 0.1},
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# Explicit, not relying on the fallback default (which is
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# "onehot", matching DEFAULT_CONFIG — see issues.md Issue 1):
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# the "physical"-labelled cases below (and this fixture's own
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# comment history) intend this as the base "physical" case,
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# with "*_onehot"/"*_embedding" cases opting in explicitly.
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"particle_type": {"target": "physical", "lambda": 1.0},
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"flow": {"time_dim": 16},
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"ddpm": {"time_dim": 16, "n_steps": 50},
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"wgan": {
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"noise_dim": 16,
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"n_critic": 2,
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"gp_weight": 10.0,
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"critic_lr": 0.0,
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},
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"router": {"enabled": False, "tie_to_stage1": False},
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},
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"train": {
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"epochs": 2,
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"batch_size": 8,
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"lr": 3e-4,
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"weight_decay": 0.01,
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"ema_decay": 0.999,
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"warmup_epochs": 0,
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"val_fraction": 0.1,
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"max_val_batches": 0,
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"num_workers": 0,
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"seed": 0,
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"validate_every": 0,
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"validate_steps": 2,
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"wandb": False,
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},
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}
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def _fake_batches(n_batches, batch_size, seed=0):
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g = torch.Generator().manual_seed(seed)
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batches = []
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for _ in range(n_batches):
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cond_cont = torch.randn(batch_size, COND_DIM, generator=g)
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cond_cat = torch.stack(
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[
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torch.randint(0, PDG_VOCAB, (batch_size,), generator=g),
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torch.randint(0, MAT_VOCAB, (batch_size,), generator=g),
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],
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dim=1,
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)
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x1 = torch.randn(batch_size, X_DIM, generator=g)
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n_sec = torch.randint(0, K_MAX, (batch_size,), generator=g)
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sec_cont = torch.randn(batch_size, K_MAX, SEC_SLOT_DIM, generator=g)
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proc_idx = torch.zeros(batch_size, dtype=torch.long)
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sec_type_idx = torch.zeros(batch_size, K_MAX, dtype=torch.long)
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batches.append(StepBatch(cond_cont, cond_cat, x1, n_sec, sec_cont, proc_idx, sec_type_idx))
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return batches
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def _model_config(cfg):
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return {
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"pdg_vocab": PDG_VOCAB,
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"mat_vocab": MAT_VOCAB,
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"conditioning": cfg["conditioning"],
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"stage1_model": cfg["stage1_model"],
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"stage2_model": cfg["stage2_model"],
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}
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def _run_train(cfg, out_dir, resume_path=None):
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model_config = _model_config(cfg)
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models = build_models(model_config)
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critics = build_critics(model_config)
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train_loader = _fake_batches(4, cfg["train"]["batch_size"])
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val_loader = _fake_batches(2, cfg["train"]["batch_size"], seed=1)
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train(
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cfg=cfg,
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models=models,
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critics=critics,
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train_loader=train_loader,
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val_loader=val_loader,
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device=torch.device("cpu"),
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out_dir=out_dir,
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normalizer_dict={"cond": {}, "target": {}, "sec_phys": {}},
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pdg_map={"22": 0},
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mat_map={"G4_AIR": 0},
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proc_map=None,
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model_config=model_config,
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total_train_batches=4,
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resume_path=resume_path,
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)
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@pytest.mark.parametrize(
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"label,mutate",
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[
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("both_flow", lambda cfg: None),
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("both_wgan", lambda cfg: cfg["stage1_model"].__setitem__("generator", "wgan")),
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(
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"mixed_stage1_flow_stage2_wgan",
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lambda cfg: None, # already the default
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),
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(
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"mixed_stage1_wgan_stage2_flow",
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lambda cfg: (
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cfg["stage1_model"].__setitem__("generator", "wgan"),
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cfg["stage2_model"].__setitem__("generator", "flow"),
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),
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),
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("stage1_only", lambda cfg: cfg["stage2_model"].__setitem__("active", False)),
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("stage2_only", lambda cfg: cfg["stage1_model"].__setitem__("active", False)),
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(
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"both_ddpm_stage1_flow_stage2",
|
|
lambda cfg: (
|
|
cfg["stage1_model"].__setitem__("generator", "ddpm"),
|
|
cfg["stage2_model"].__setitem__("generator", "flow"),
|
|
),
|
|
),
|
|
(
|
|
"routed_stage1_energy_gumbel",
|
|
lambda cfg: cfg["stage1_model"].__setitem__(
|
|
"router",
|
|
{
|
|
"enabled": True,
|
|
"type": "energy",
|
|
"n_experts": 3,
|
|
"temperature": 0.5,
|
|
"learn_centers": True,
|
|
"lambda_balance": 0.1,
|
|
"lambda_entropy": 0.01,
|
|
"gumbel": True,
|
|
"gumbel_tau_start": 1.0,
|
|
"gumbel_tau_end": 0.1,
|
|
},
|
|
),
|
|
),
|
|
(
|
|
"stage2_onehot_target_wgan",
|
|
lambda cfg: cfg["stage2_model"].__setitem__("particle_type", {"target": "onehot", "lambda": 1.0}),
|
|
),
|
|
(
|
|
"stage2_onehot_target_flow",
|
|
lambda cfg: (
|
|
cfg["stage2_model"].__setitem__("generator", "flow"),
|
|
cfg["stage2_model"].__setitem__("particle_type", {"target": "onehot", "lambda": 1.0}),
|
|
),
|
|
),
|
|
(
|
|
"stage2_embedding_target_wgan",
|
|
lambda cfg: (
|
|
cfg["conditioning"]["particle"].__setitem__("type", "embedding"),
|
|
cfg["conditioning"]["material"].__setitem__("type", "embedding"),
|
|
cfg["stage2_model"].__setitem__("particle_type", {"target": "embedding", "lambda": 1.0}),
|
|
),
|
|
),
|
|
(
|
|
"stage2_embedding_target_flow",
|
|
lambda cfg: (
|
|
cfg["conditioning"]["particle"].__setitem__("type", "embedding"),
|
|
cfg["conditioning"]["material"].__setitem__("type", "embedding"),
|
|
cfg["stage2_model"].__setitem__("generator", "flow"),
|
|
cfg["stage2_model"].__setitem__("particle_type", {"target": "embedding", "lambda": 1.0}),
|
|
),
|
|
),
|
|
(
|
|
"ar_wgan_onehot",
|
|
lambda cfg: (
|
|
cfg["stage2_model"].__setitem__("decoder", "autoregressive"),
|
|
cfg["stage2_model"].__setitem__("particle_type", {"target": "onehot", "lambda": 1.0}),
|
|
),
|
|
),
|
|
(
|
|
"ar_wgan_physical",
|
|
lambda cfg: cfg["stage2_model"].__setitem__("decoder", "autoregressive"),
|
|
),
|
|
(
|
|
"ar_flow_onehot",
|
|
lambda cfg: (
|
|
cfg["stage2_model"].__setitem__("decoder", "autoregressive"),
|
|
cfg["stage2_model"].__setitem__("generator", "flow"),
|
|
cfg["stage2_model"].__setitem__("particle_type", {"target": "onehot", "lambda": 1.0}),
|
|
),
|
|
),
|
|
(
|
|
"ar_flow_embedding",
|
|
lambda cfg: (
|
|
cfg["conditioning"]["particle"].__setitem__("type", "embedding"),
|
|
cfg["conditioning"]["material"].__setitem__("type", "embedding"),
|
|
cfg["stage2_model"].__setitem__("decoder", "autoregressive"),
|
|
cfg["stage2_model"].__setitem__("generator", "flow"),
|
|
cfg["stage2_model"].__setitem__("particle_type", {"target": "embedding", "lambda": 1.0}),
|
|
),
|
|
),
|
|
(
|
|
"ar_stage2_only",
|
|
lambda cfg: (
|
|
cfg["stage1_model"].__setitem__("active", False),
|
|
cfg["stage2_model"].__setitem__("decoder", "autoregressive"),
|
|
),
|
|
),
|
|
(
|
|
"ar_mixed_stage1_wgan_stage2_flow_onehot",
|
|
lambda cfg: (
|
|
cfg["stage1_model"].__setitem__("generator", "wgan"),
|
|
cfg["stage2_model"].__setitem__("generator", "flow"),
|
|
cfg["stage2_model"].__setitem__("decoder", "autoregressive"),
|
|
cfg["stage2_model"].__setitem__("particle_type", {"target": "onehot", "lambda": 1.0}),
|
|
),
|
|
),
|
|
],
|
|
)
|
|
def test_train_end_to_end(label, mutate):
|
|
cfg = _base_cfg()
|
|
mutate(cfg)
|
|
with tempfile.TemporaryDirectory() as tmp:
|
|
out_dir = Path(tmp) / "run"
|
|
_run_train(cfg, out_dir)
|
|
assert (out_dir / "last.pt").exists()
|
|
assert (out_dir / "metrics.csv").exists()
|
|
ckpt = torch.load(out_dir / "last.pt", weights_only=False)
|
|
if cfg["stage1_model"]["active"]:
|
|
assert "model" in ckpt
|
|
else:
|
|
assert "model" not in ckpt
|
|
if cfg["stage2_model"]["active"]:
|
|
assert "sec_decoder" in ckpt
|
|
else:
|
|
assert "sec_decoder" not in ckpt
|
|
|
|
|
|
def test_train_resume_continues_from_checkpoint():
|
|
cfg = _base_cfg()
|
|
with tempfile.TemporaryDirectory() as tmp:
|
|
out_dir = Path(tmp) / "run"
|
|
_run_train(cfg, out_dir)
|
|
ckpt_before = torch.load(out_dir / "last.pt", weights_only=False)
|
|
assert ckpt_before["epoch"] == 2
|
|
|
|
cfg2 = copy.deepcopy(cfg)
|
|
cfg2["train"]["epochs"] = 3
|
|
_run_train(cfg2, out_dir, resume_path=out_dir / "last.pt")
|
|
ckpt_after = torch.load(out_dir / "last.pt", weights_only=False)
|
|
assert ckpt_after["epoch"] == 3
|
|
assert ckpt_after["global_step"] > ckpt_before["global_step"]
|
|
|
|
|
|
def test_train_raises_when_no_active_stage():
|
|
cfg = _base_cfg()
|
|
cfg["stage1_model"]["active"] = False
|
|
cfg["stage2_model"]["active"] = False
|
|
model_config = _model_config(cfg)
|
|
models = build_models(model_config)
|
|
critics = build_critics(model_config)
|
|
with tempfile.TemporaryDirectory() as tmp:
|
|
with pytest.raises(ValueError, match="no active stage"):
|
|
train(
|
|
cfg=cfg,
|
|
models=models,
|
|
critics=critics,
|
|
train_loader=_fake_batches(1, 8),
|
|
val_loader=_fake_batches(1, 8),
|
|
device=torch.device("cpu"),
|
|
out_dir=Path(tmp) / "run",
|
|
model_config=model_config,
|
|
total_train_batches=1,
|
|
)
|
|
|
|
|
|
def test_metrics_csv_columns_are_stage_prefixed():
|
|
cfg = _base_cfg()
|
|
with tempfile.TemporaryDirectory() as tmp:
|
|
out_dir = Path(tmp) / "run"
|
|
_run_train(cfg, out_dir)
|
|
header = (out_dir / "metrics.csv").read_text().splitlines()[0].split(",")
|
|
assert "stage1/train/loss" in header
|
|
assert "stage2/train/d_loss" in header
|
|
assert "val/loss" in header
|
|
assert "epoch" in header
|
|
|
|
|
|
def test_wgan_stage_trainer_skips_generator_step_when_no_grad_this_batch():
|
|
"""Regression test: on a non-generator-step batch, if this stage's model
|
|
has no n_sec_head (n_sec defaults to stage 2), g_loss is a
|
|
graph-less zero — .backward() must not be called on it."""
|
|
cfg = _base_cfg()
|
|
cfg["stage1_model"]["generator"] = "wgan"
|
|
model_config = _model_config(cfg)
|
|
models = build_models(model_config)
|
|
critics = build_critics(model_config)
|
|
assert models["stage1"] is not None and critics["stage1"] is not None
|
|
spec = StageSpec(
|
|
name="stage1",
|
|
is_stage2=False,
|
|
generator="wgan",
|
|
n_critic=1000, # never a generator step in this test
|
|
ema_decay=0.0,
|
|
steps_per_epoch=4,
|
|
)
|
|
trainer = WGANStageTrainer(spec, models["stage1"], critics["stage1"], torch.device("cpu"))
|
|
assert trainer.model.n_sec_head is None
|
|
batch = _fake_batches(1, 8)[0]
|
|
stats = trainer.step(batch, torch.device("cpu"), global_step=1)
|
|
assert stats["did_g_step"] is False
|
|
|
|
|
|
def test_flow_stage_trainer_ddpm_not_implemented_for_stage2():
|
|
spec = StageSpec(name="stage2", is_stage2=True, generator="ddpm", ddpm_n_steps=50, ema_decay=0.0)
|
|
with pytest.raises(NotImplementedError):
|
|
FlowDDPMStageTrainer(spec, torch.nn.Linear(1, 1), torch.device("cpu"))
|
|
|
|
|
|
def test_stage_spec_from_config_omitted_decoder_and_particle_type_match_default_config():
|
|
"""Regression for issues.md Issue 1: StageSpec.from_config's own fallback
|
|
defaults for stage2_model.decoder/particle_type must equal
|
|
DEFAULT_CONFIG's ("autoregressive" / "onehot"), not the old, now-wrong
|
|
("one_shot" / "physical") literals a .get(key, default) call used to
|
|
supply when a hand-built cfg omitted these keys."""
|
|
cfg = _base_cfg()
|
|
del cfg["stage2_model"]["decoder"]
|
|
del cfg["stage2_model"]["particle_type"]
|
|
spec = StageSpec.from_config(cfg, "stage2", is_stage2=True, steps_per_epoch=1)
|
|
assert spec.decoder == "autoregressive"
|
|
assert spec.particle_type.target == "onehot"
|
|
|
|
|
|
def _routed_stage1_trainer(lambda_balance, lambda_proc, lambda_entropy):
|
|
cfg = _base_cfg()
|
|
cfg["stage1_model"]["router"] = {
|
|
"enabled": True,
|
|
"type": "energy",
|
|
"n_experts": 3,
|
|
"temperature": 0.5,
|
|
"learn_centers": True,
|
|
"lambda_balance": lambda_balance,
|
|
"lambda_proc": lambda_proc,
|
|
"lambda_entropy": lambda_entropy,
|
|
}
|
|
model_config = _model_config(cfg)
|
|
models = build_models(model_config)
|
|
critics = build_critics(model_config)
|
|
trainers = build_stage_trainers(cfg, models, critics, torch.device("cpu"), total_train_batches=4)
|
|
return trainers["stage1"]
|
|
|
|
|
|
def test_router_aux_losses_skipped_when_lambda_zero_but_run_when_positive():
|
|
"""Gitea #31: FlowDDPMStageTrainer._compute must not call
|
|
router.balance_loss/classify_loss/entropy_loss when the corresponding
|
|
lambda is 0 (the default) -- those calls do their own router.gate(...)
|
|
forward pass that is wasted once the term is masked out of the total
|
|
loss anyway. Checked both ways: zero lambdas must skip all three calls,
|
|
positive lambdas must still make them (the guard must not accidentally
|
|
suppress the real path)."""
|
|
batch = _fake_batches(1, 4)[0]
|
|
device = torch.device("cpu")
|
|
|
|
trainer_zero = _routed_stage1_trainer(0.0, 0.0, 0.0)
|
|
router_zero = trainer_zero.router
|
|
router_zero.balance_loss = MagicMock(wraps=router_zero.balance_loss)
|
|
router_zero.classify_loss = MagicMock(wraps=router_zero.classify_loss)
|
|
router_zero.entropy_loss = MagicMock(wraps=router_zero.entropy_loss)
|
|
stats_zero = trainer_zero.step(batch, device, global_step=1)
|
|
assert router_zero.balance_loss.call_count == 0
|
|
assert router_zero.classify_loss.call_count == 0
|
|
assert router_zero.entropy_loss.call_count == 0
|
|
assert stats_zero["loss_balance"] == 0.0
|
|
assert stats_zero["loss_proc"] == 0.0
|
|
assert stats_zero["loss_entropy"] == 0.0
|
|
|
|
trainer_pos = _routed_stage1_trainer(0.1, 0.1, 0.01)
|
|
router_pos = trainer_pos.router
|
|
router_pos.balance_loss = MagicMock(wraps=router_pos.balance_loss)
|
|
router_pos.classify_loss = MagicMock(wraps=router_pos.classify_loss)
|
|
router_pos.entropy_loss = MagicMock(wraps=router_pos.entropy_loss)
|
|
trainer_pos.step(batch, device, global_step=1)
|
|
assert router_pos.balance_loss.call_count == 1
|
|
assert router_pos.classify_loss.call_count == 1
|
|
assert router_pos.entropy_loss.call_count == 1
|
|
|
|
|
|
# --- AR trainer wiring (v0.3.0 step 5) --------------------------------------
|
|
|
|
|
|
@pytest.mark.parametrize("teacher_forcing", ["always", "scheduled", "never"])
|
|
@pytest.mark.parametrize("history", ["markov", "attention"])
|
|
@pytest.mark.parametrize("stage2_generator", ["wgan", "flow"])
|
|
def test_build_stage_trainers_ar_scheduled_and_attention_step_runs(teacher_forcing, history, stage2_generator):
|
|
"""v0.3.0 step 7: history='attention' and teacher_forcing in
|
|
{'scheduled', 'never'} must actually train — a stage-2 AR trainer.step()
|
|
must run and produce a finite loss, for every {history} x
|
|
{teacher_forcing} x {generator} combination."""
|
|
cfg = _base_cfg()
|
|
cfg["stage2_model"]["decoder"] = "autoregressive"
|
|
cfg["stage2_model"]["generator"] = stage2_generator
|
|
cfg["stage2_model"]["autoregressive"] = {
|
|
"history": history,
|
|
"teacher_forcing": teacher_forcing,
|
|
"tf_p_start": 1.0,
|
|
"tf_p_end": 0.0,
|
|
"attn_n_heads": 2,
|
|
"attn_n_layers": 1,
|
|
}
|
|
model_config = _model_config(cfg)
|
|
models = build_models(model_config)
|
|
critics = build_critics(model_config)
|
|
trainers = build_stage_trainers(cfg, models, critics, torch.device("cpu"), total_train_batches=4)
|
|
trainer = trainers["stage2"]
|
|
batch = _fake_batches(1, 4)[0]
|
|
stats = trainer.step(batch, torch.device("cpu"), global_step=1)
|
|
loss_key = "g_loss" if stage2_generator == "wgan" else "loss"
|
|
assert math.isfinite(stats[loss_key])
|
|
|
|
|
|
@pytest.mark.parametrize("stage2_generator", ["wgan", "flow"])
|
|
def test_train_end_to_end_ar_attention_history_scheduled_teacher_forcing(
|
|
stage2_generator,
|
|
):
|
|
"""Full `train()` run (not just one `trainer.step()` call) with
|
|
history='attention' AND teacher_forcing='scheduled' together — the
|
|
combination v0.3.0 step 7 exists to land — must complete and write a
|
|
checkpoint + metrics.csv with finite losses throughout."""
|
|
cfg = _base_cfg()
|
|
cfg["stage2_model"]["decoder"] = "autoregressive"
|
|
cfg["stage2_model"]["generator"] = stage2_generator
|
|
cfg["stage2_model"]["autoregressive"] = {
|
|
"history": "attention",
|
|
"teacher_forcing": "scheduled",
|
|
"tf_p_start": 1.0,
|
|
"tf_p_end": 0.0,
|
|
"attn_n_heads": 2,
|
|
"attn_n_layers": 1,
|
|
}
|
|
with tempfile.TemporaryDirectory() as tmp:
|
|
out_dir = Path(tmp) / "run"
|
|
_run_train(cfg, out_dir)
|
|
assert (out_dir / "last.pt").exists()
|
|
with open(out_dir / "metrics.csv", newline="") as f:
|
|
rows = list(csv.DictReader(f))
|
|
assert len(rows) == cfg["train"]["epochs"]
|
|
loss_col = "stage2/train/g_loss" if stage2_generator == "wgan" else "stage2/train/loss"
|
|
assert all(math.isfinite(float(r[loss_col])) for r in rows)
|
|
|
|
|
|
def test_ar_wgan_onehot_grad_norm_instrumentation_populates_metrics():
|
|
"""Differentiability validation-obligation instrumentation: the
|
|
trunk-gradient-norm-by-slice columns must appear and actually fire for
|
|
generator='wgan' + particle_type.target='onehot' under decoder=
|
|
'autoregressive' (added at v0.3.0 step 5 to accrue evidence during the
|
|
architecture comparison)."""
|
|
cfg = _base_cfg()
|
|
cfg["stage2_model"]["decoder"] = "autoregressive"
|
|
cfg["stage2_model"]["particle_type"] = {"target": "onehot", "lambda": 1.0}
|
|
with tempfile.TemporaryDirectory() as tmp:
|
|
out_dir = Path(tmp) / "run"
|
|
_run_train(cfg, out_dir)
|
|
with open(out_dir / "metrics.csv", newline="") as f:
|
|
rows = list(csv.DictReader(f))
|
|
assert "stage2/train/grad_norm_type_slice" in rows[0]
|
|
assert "stage2/train/grad_norm_cont_slice" in rows[0]
|
|
assert any(float(r["stage2/train/grad_norm_type_slice"]) > 0 for r in rows)
|
|
assert any(float(r["stage2/train/grad_norm_cont_slice"]) > 0 for r in rows)
|
|
|
|
|
|
def test_wgan_onehot_one_shot_also_gets_grad_norm_instrumentation():
|
|
"""The instrumentation is decoder-agnostic — one_shot + wgan + onehot
|
|
must populate the same columns."""
|
|
cfg = _base_cfg()
|
|
cfg["stage2_model"]["particle_type"] = {"target": "onehot", "lambda": 1.0}
|
|
with tempfile.TemporaryDirectory() as tmp:
|
|
out_dir = Path(tmp) / "run"
|
|
_run_train(cfg, out_dir)
|
|
with open(out_dir / "metrics.csv", newline="") as f:
|
|
rows = list(csv.DictReader(f))
|
|
assert any(float(r["stage2/train/grad_norm_type_slice"]) > 0 for r in rows)
|
|
assert any(float(r["stage2/train/grad_norm_cont_slice"]) > 0 for r in rows)
|
|
|
|
|
|
# --- n_sec.mode = "stop_token" (gitea #40) ----------------------------------
|
|
|
|
|
|
def _stop_token_cfg():
|
|
cfg = _base_cfg()
|
|
cfg["stage2_model"]["decoder"] = "autoregressive"
|
|
cfg["stage2_model"]["n_sec"] = {"mode": "stop_token", "lambda": 0.1}
|
|
return cfg
|
|
|
|
|
|
@pytest.mark.parametrize("stage2_generator", ["wgan", "flow"])
|
|
def test_build_stage_trainers_stop_token_step_runs(stage2_generator):
|
|
"""A stop_token AR stage-2 trainer.step() must run and emit a finite
|
|
loss_stop for both non-adversarial (flow) and WGAN generators — the two
|
|
trainer subclasses wire the stop head's BCE term in independently."""
|
|
cfg = _stop_token_cfg()
|
|
cfg["stage2_model"]["generator"] = stage2_generator
|
|
model_config = _model_config(cfg)
|
|
models = build_models(model_config)
|
|
critics = build_critics(model_config)
|
|
trainers = build_stage_trainers(cfg, models, critics, torch.device("cpu"), total_train_batches=4)
|
|
trainer = trainers["stage2"]
|
|
batch = _fake_batches(1, 4)[0]
|
|
stats = trainer.step(batch, torch.device("cpu"), global_step=1)
|
|
assert math.isfinite(stats["loss_stop"])
|
|
assert math.isfinite(stats["stop_acc"])
|
|
|
|
|
|
def test_stop_token_model_has_stop_head_not_n_sec_head():
|
|
cfg = _stop_token_cfg()
|
|
model_config = _model_config(cfg)
|
|
models = build_models(model_config)
|
|
stage2 = models["stage2"]
|
|
assert isinstance(stage2, Stage2Autoregressive)
|
|
assert stage2.n_sec_head is None
|
|
assert stage2.stop_head is not None
|
|
|
|
|
|
def test_head_mode_model_has_n_sec_head_not_stop_head():
|
|
"""Sanity check on the other side of the gate — the default 'head' mode
|
|
must be unaffected by the stop_head plumbing."""
|
|
cfg = _base_cfg()
|
|
cfg["stage2_model"]["decoder"] = "autoregressive"
|
|
model_config = _model_config(cfg)
|
|
models = build_models(model_config)
|
|
stage2 = models["stage2"]
|
|
assert isinstance(stage2, Stage2Autoregressive)
|
|
assert stage2.n_sec_head is not None
|
|
assert stage2.stop_head is None
|
|
|
|
|
|
def test_train_end_to_end_stop_token():
|
|
"""Full train() run with n_sec.mode='stop_token' must complete and write
|
|
a checkpoint + metrics.csv with finite losses throughout."""
|
|
cfg = _stop_token_cfg()
|
|
with tempfile.TemporaryDirectory() as tmp:
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out_dir = Path(tmp) / "run"
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_run_train(cfg, out_dir)
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assert (out_dir / "last.pt").exists()
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with open(out_dir / "metrics.csv", newline="") as f:
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rows = list(csv.DictReader(f))
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assert len(rows) == cfg["train"]["epochs"]
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assert all(math.isfinite(float(r["stage2/train/loss_stop"])) for r in rows)
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|
|
|
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def test_wgan_physical_omits_grad_norm_slice_columns():
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cfg = _base_cfg() # _base_cfg's stage2_model.particle_type.target is "physical"
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with tempfile.TemporaryDirectory() as tmp:
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|
out_dir = Path(tmp) / "run"
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|
_run_train(cfg, out_dir)
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header = (out_dir / "metrics.csv").read_text().splitlines()[0].split(",")
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assert "stage2/train/grad_norm_type_slice" not in header
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assert "stage2/train/grad_norm_cont_slice" not in header
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|
|
|
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# --- stage2_model.stage1_context = "sampled" (gitea #41) --------------------
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|
|
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def _sampled_ctx_cfg(ema_decay=0.999):
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cfg = _base_cfg()
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cfg["stage1_model"]["generator"] = "flow"
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|
cfg["stage2_model"]["generator"] = "flow"
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|
cfg["stage2_model"]["stage1_context"] = "sampled"
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|
cfg["stage2_model"]["ctx_p_start"] = 0.0
|
|
cfg["stage2_model"]["ctx_p_end"] = 0.0
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cfg["train"]["ema_decay"] = ema_decay
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|
return cfg
|
|
|
|
|
|
def _build_sampled_trainers(cfg):
|
|
model_config = _model_config(cfg)
|
|
models = build_models(model_config)
|
|
critics = build_critics(model_config)
|
|
return build_stage_trainers(cfg, models, critics, torch.device("cpu"), total_train_batches=4)
|
|
|
|
|
|
def test_build_stage_trainers_attaches_stage1_only_under_sampled():
|
|
trainers = _build_sampled_trainers(_sampled_ctx_cfg())
|
|
assert trainers["stage2"].stage1_source is trainers["stage1"]
|
|
assert trainers["stage1"].stage1_source is None
|
|
|
|
|
|
def test_build_stage_trainers_leaves_stage1_source_none_under_truth():
|
|
"""Regression guard for the old silent no-op: 'truth' (the default) must
|
|
never attach a stage1_source, so _stage1_context short-circuits without
|
|
ever calling sample_stage1."""
|
|
cfg = _base_cfg()
|
|
trainers = _build_sampled_trainers(cfg)
|
|
assert trainers["stage2"].stage1_source is None
|
|
|
|
|
|
def test_stage1_context_sampled_calls_sample_stage1_and_differs_from_truth():
|
|
cfg = _sampled_ctx_cfg()
|
|
trainers = _build_sampled_trainers(cfg)
|
|
stage1, stage2 = trainers["stage1"], trainers["stage2"]
|
|
batch = _fake_batches(1, 4)[0]
|
|
cond_cont, cond_cat, x1_s1 = batch.cond_cont, batch.cond_cat, batch.target_s1
|
|
|
|
with patch("giant.training.trainers.sample_stage1", wraps=trainers_sample_stage1) as spy:
|
|
ctx = stage2._stage1_context(x1_s1, cond_cont, cond_cat, epoch=0)
|
|
assert spy.call_count == 1
|
|
assert spy.call_args.args[0] is stage1.sampling_model()
|
|
assert not torch.equal(ctx, x1_s1)
|
|
|
|
|
|
def test_stage1_context_truth_default_never_calls_sample_stage1():
|
|
cfg = _base_cfg()
|
|
trainers = _build_sampled_trainers(cfg)
|
|
stage2 = trainers["stage2"]
|
|
batch = _fake_batches(1, 4)[0]
|
|
cond_cont, cond_cat, x1_s1 = batch.cond_cont, batch.cond_cat, batch.target_s1
|
|
|
|
with patch("giant.training.trainers.sample_stage1", wraps=trainers_sample_stage1) as spy:
|
|
ctx = stage2._stage1_context(x1_s1, cond_cont, cond_cat, epoch=0)
|
|
assert spy.call_count == 0
|
|
assert torch.equal(ctx, x1_s1)
|
|
|
|
|
|
def test_stage1_context_val_epoch_none_uses_ground_truth_even_under_sampled():
|
|
cfg = _sampled_ctx_cfg()
|
|
trainers = _build_sampled_trainers(cfg)
|
|
stage2 = trainers["stage2"]
|
|
batch = _fake_batches(1, 4)[0]
|
|
cond_cont, cond_cat, x1_s1 = batch.cond_cont, batch.cond_cat, batch.target_s1
|
|
|
|
with patch("giant.training.trainers.sample_stage1", wraps=trainers_sample_stage1) as spy:
|
|
ctx = stage2._stage1_context(x1_s1, cond_cont, cond_cat, epoch=None)
|
|
assert spy.call_count == 0
|
|
assert torch.equal(ctx, x1_s1)
|
|
|
|
|
|
def test_stage1_context_sampled_preserves_stage1_training_mode():
|
|
"""Every sampler in giant/sample.py flips its model to .eval() as a side
|
|
effect with no restore of its own (see sample_flow). Sampling from the
|
|
RAW stage-1 model (ema_decay=0, so sampling_model() returns self.model,
|
|
the same weights the stage-1 trainer is actively training on) must not
|
|
silently leave it in eval mode for the rest of the epoch's stage-1
|
|
updates."""
|
|
cfg = _sampled_ctx_cfg(ema_decay=0.0)
|
|
trainers = _build_sampled_trainers(cfg)
|
|
stage1, stage2 = trainers["stage1"], trainers["stage2"]
|
|
stage1.train_mode()
|
|
assert stage1.model.training
|
|
batch = _fake_batches(1, 4)[0]
|
|
cond_cont, cond_cat, x1_s1 = batch.cond_cont, batch.cond_cat, batch.target_s1
|
|
|
|
stage2._stage1_context(x1_s1, cond_cont, cond_cat, epoch=0)
|
|
assert stage1.model.training
|
|
|
|
|
|
@pytest.mark.parametrize("stage2_generator", ["wgan", "flow"])
|
|
def test_build_stage_trainers_sampled_step_runs(stage2_generator):
|
|
"""Both trainer subclasses' call sites (FlowDDPMStageTrainer._compute,
|
|
WGANStageTrainer.step) must run end to end under 'sampled' and produce a
|
|
finite loss."""
|
|
cfg = _sampled_ctx_cfg()
|
|
cfg["stage2_model"]["generator"] = stage2_generator
|
|
trainers = _build_sampled_trainers(cfg)
|
|
trainer = trainers["stage2"]
|
|
batch = _fake_batches(1, 4)[0]
|
|
stats = trainer.step(batch, torch.device("cpu"), global_step=1)
|
|
loss_key = "g_loss" if stage2_generator == "wgan" else "loss"
|
|
assert math.isfinite(stats[loss_key])
|
|
|
|
|
|
def test_train_end_to_end_stage1_context_sampled():
|
|
"""Full train() run with stage1_context='sampled' must complete and
|
|
write a checkpoint + metrics.csv with finite losses throughout."""
|
|
cfg = _sampled_ctx_cfg()
|
|
with tempfile.TemporaryDirectory() as tmp:
|
|
out_dir = Path(tmp) / "run"
|
|
_run_train(cfg, out_dir)
|
|
assert (out_dir / "last.pt").exists()
|
|
with open(out_dir / "metrics.csv", newline="") as f:
|
|
rows = list(csv.DictReader(f))
|
|
assert len(rows) == cfg["train"]["epochs"]
|
|
assert all(math.isfinite(float(r["stage2/train/loss"])) for r in rows)
|