a81174561e
Implements the ASFT objective (DFT-style reweighting + KL anchoring) with Unsloth trainer/CLI integration, tests, and an ASFT/ASFT+ demo notebook. Credits: https://github.com/zhuchichi56/ASFT
631 lines
22 KiB
Python
631 lines
22 KiB
Python
# Copyright 2023-present Daniel Han-Chen & the Unsloth team. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Tests for ASFT (Anchored Supervised Fine-Tuning) loss module."""
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import pytest
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import torch
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import torch.nn as nn
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import torch.nn.functional as F
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from types import SimpleNamespace
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from unittest.mock import MagicMock, patch
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HAS_CUDA = torch.cuda.is_available()
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if not HAS_CUDA:
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pytest.skip("CUDA is required for ASFT tests", allow_module_level = True)
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torch.set_default_device("cuda")
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from unsloth.losses.asft import (
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ASFTStreamingConfig,
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effective_logits,
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fast_cross_entropy_loss_per_token,
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build_shift_labels,
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get_reference_forward_callable,
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compute_asft_loss,
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_compute_kl_divergence,
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_compute_dft_weights,
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)
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# -----------------------------------------------------------------------------
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# Test Fixtures
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# -----------------------------------------------------------------------------
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@pytest.fixture
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def dummy_logits():
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"""Create dummy logits tensor (B=2, T=4, V=8)."""
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torch.manual_seed(42)
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return torch.randn(2, 4, 8, requires_grad = True)
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@pytest.fixture
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def dummy_labels():
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"""Create dummy labels tensor with some -100 values."""
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# Labels: [0, 1, 2, 3] and [4, 5, -100, -100]
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return torch.tensor([[0, 1, 2, 3], [4, 5, -100, -100]], dtype = torch.long)
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@pytest.fixture
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def simple_model():
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"""Create a simple model for testing."""
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class SimpleModel(nn.Module):
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def __init__(self):
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super().__init__()
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self.config = SimpleNamespace(
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final_logit_softcapping = 0,
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logit_scale = 0,
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)
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self.embedding = nn.Embedding(16, 8)
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self.linear = nn.Linear(8, 8)
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def forward(self, input_ids = None, **kwargs):
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# Deterministic forward with gradients
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embeddings = self.embedding(input_ids)
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logits = self.linear(embeddings)
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return SimpleNamespace(logits = logits)
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return SimpleModel()
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# -----------------------------------------------------------------------------
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# A1) Test effective_logits
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# -----------------------------------------------------------------------------
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class TestEffectiveLogits:
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"""Tests for effective_logits function."""
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def test_no_transformation(self, dummy_logits):
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"""Test that no transformation is applied when softcapping/scaling are 0."""
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result = effective_logits(dummy_logits, logit_softcapping = 0, logit_scaling = 0)
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# Should be close to original (converted to float32)
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assert torch.allclose(result, dummy_logits.float(), atol = 1e-6)
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def test_logit_scaling(self, dummy_logits):
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"""Test logit scaling: t * x."""
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scale = 2.0
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result = effective_logits(dummy_logits, logit_scaling = scale)
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expected = scale * dummy_logits.float()
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assert torch.allclose(result, expected, atol = 1e-6)
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def test_logit_softcapping(self, dummy_logits):
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"""Test logit softcapping: t * tanh(x / t)."""
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softcap = 30.0
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result = effective_logits(dummy_logits, logit_softcapping = softcap)
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expected = softcap * torch.tanh(dummy_logits.float() / softcap)
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assert torch.allclose(result, expected, atol = 1e-6)
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def test_both_transformations(self, dummy_logits):
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"""Test both scaling and softcapping together."""
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scale = 2.0
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softcap = 30.0
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result = effective_logits(
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dummy_logits, logit_softcapping = softcap, logit_scaling = scale
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)
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# Scaling first, then softcapping
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x = scale * dummy_logits.float()
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expected = softcap * torch.tanh(x / softcap)
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assert torch.allclose(result, expected, atol = 1e-6)
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def test_reads_from_model_config(self):
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"""Test reading config from model."""
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model = SimpleNamespace(
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config = SimpleNamespace(
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final_logit_softcapping = 30.0,
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logit_scale = 2.0,
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)
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)
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logits = torch.randn(2, 4, 8)
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result = effective_logits(logits, model)
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# Should apply both transformations
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x = 2.0 * logits.float()
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expected = 30.0 * torch.tanh(x / 30.0)
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assert torch.allclose(result, expected, atol = 1e-6)
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# -----------------------------------------------------------------------------
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# A2) Test fast_cross_entropy_loss_per_token
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# -----------------------------------------------------------------------------
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class TestFastCrossEntropyLossPerToken:
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"""Tests for fast_cross_entropy_loss_per_token function."""
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def test_basic_loss_computation(self, dummy_logits, dummy_labels):
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"""Test basic per-token CE loss computation."""
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losses, valid_mask = fast_cross_entropy_loss_per_token(
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dummy_logits.detach(), dummy_labels
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)
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# Check shapes
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batch, seq_len = dummy_labels.shape
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assert losses.shape == (batch * seq_len,)
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assert valid_mask.shape == (batch * seq_len,)
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# Check that valid_mask correctly identifies -100 positions
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flat_labels = dummy_labels.view(-1)
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expected_valid = flat_labels != -100
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assert torch.equal(valid_mask, expected_valid)
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def test_ignored_positions_have_zero_loss(self, dummy_logits, dummy_labels):
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"""Test that positions with label -100 have zero loss."""
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losses, valid_mask = fast_cross_entropy_loss_per_token(
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dummy_logits.detach(), dummy_labels
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)
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# Loss at ignored positions should be 0
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assert torch.all(losses[~valid_mask] == 0)
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def test_valid_positions_have_nonzero_loss(self, dummy_logits, dummy_labels):
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"""Test that valid positions have non-zero loss."""
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losses, valid_mask = fast_cross_entropy_loss_per_token(
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dummy_logits.detach(), dummy_labels
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)
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# At least some valid positions should have non-zero loss
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assert torch.any(losses[valid_mask] > 0)
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def test_matches_pytorch_ce(self):
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"""Test that results match PyTorch CE loss."""
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torch.manual_seed(42)
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logits = torch.randn(2, 4, 8)
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labels = torch.tensor([[0, 1, 2, 3], [4, 5, 6, 7]], dtype = torch.long)
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losses, valid_mask = fast_cross_entropy_loss_per_token(logits, labels)
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# Compare with PyTorch
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flat_logits = logits.view(-1, 8)
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flat_labels = labels.view(-1)
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pytorch_losses = F.cross_entropy(flat_logits, flat_labels, reduction = "none")
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# Should be close
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assert torch.allclose(losses, pytorch_losses, atol = 1e-4)
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# -----------------------------------------------------------------------------
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# A3) Test build_shift_labels
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# -----------------------------------------------------------------------------
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class TestBuildShiftLabels:
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"""Tests for build_shift_labels function."""
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def test_basic_shift(self):
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"""Test basic label shifting."""
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labels = torch.tensor([[0, 1, 2, 3], [4, 5, 6, 7]], dtype = torch.long)
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shift_labels = build_shift_labels(labels)
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# shift_labels[..., :-1] = labels[..., 1:]
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# shift_labels[..., -1] = -100
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expected = torch.tensor([[1, 2, 3, -100], [5, 6, 7, -100]], dtype = torch.long)
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assert torch.equal(shift_labels, expected)
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def test_preserves_ignore_index(self):
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"""Test that existing -100 values are preserved after shift."""
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labels = torch.tensor([[0, 1, -100, -100], [4, 5, 6, -100]], dtype = torch.long)
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shift_labels = build_shift_labels(labels)
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# First row: [1, -100, -100, -100]
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# Second row: [5, 6, -100, -100]
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expected = torch.tensor(
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[[1, -100, -100, -100], [5, 6, -100, -100]], dtype = torch.long
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)
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assert torch.equal(shift_labels, expected)
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def test_with_packed_seq_lengths(self):
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"""Test shift labels with packed sequence boundary masking."""
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# Single row with packed sequences of lengths [2, 2]
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labels = torch.tensor([[0, 1, 2, 3]], dtype = torch.long)
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packed_seq_lengths = torch.tensor([2, 2], dtype = torch.int32)
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shift_labels = build_shift_labels(labels, packed_seq_lengths)
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# After shift: [1, 2, 3, -100]
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# After boundary masking at positions 1 and 3: [1, -100, 3, -100]
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# Actually boundary positions are cumsum - 1 = [1, 3]
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# So positions 1 and 3 should be -100
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assert shift_labels[0, 1].item() == -100 # End of first sequence
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assert shift_labels[0, 3].item() == -100 # End of second sequence (also last)
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# -----------------------------------------------------------------------------
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# A4) Test get_reference_forward_callable
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# -----------------------------------------------------------------------------
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class TestGetReferenceForwardCallable:
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"""Tests for get_reference_forward_callable function."""
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def test_disable_adapter_policy(self, simple_model):
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"""Test disable_adapter policy when model has adapters."""
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# Mock disable_adapter
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simple_model.disable_adapter = MagicMock()
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simple_model.disable_adapter.__enter__ = MagicMock(return_value = None)
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simple_model.disable_adapter.__exit__ = MagicMock(return_value = False)
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ref_forward = get_reference_forward_callable(
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simple_model, reference_policy = "disable_adapter"
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)
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# Call the forward
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input_ids = torch.tensor([[1, 2, 3, 4]])
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result = ref_forward(input_ids = input_ids)
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# Should have called disable_adapter
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assert simple_model.disable_adapter.__enter__.called
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def test_frozen_copy_policy(self, simple_model):
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"""Test frozen_copy policy."""
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ref_forward = get_reference_forward_callable(
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simple_model, reference_policy = "frozen_copy"
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)
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input_ids = torch.tensor([[1, 2, 3, 4]])
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result = ref_forward(input_ids = input_ids)
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# Should return logits
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assert result.shape[0] == 1 # batch size
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assert result.shape[1] == 4 # seq len
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def test_fallback_to_frozen_copy_without_adapters(self, simple_model):
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"""Test that disable_adapter falls back to frozen_copy when no adapters."""
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# Model without disable_adapter method
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ref_forward = get_reference_forward_callable(
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simple_model, reference_policy = "disable_adapter"
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)
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input_ids = torch.tensor([[1, 2, 3, 4]])
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result = ref_forward(input_ids = input_ids)
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# Should still work (uses frozen copy fallback)
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assert result is not None
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# -----------------------------------------------------------------------------
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# Test KL divergence computation
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# -----------------------------------------------------------------------------
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class TestKLDivergence:
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"""Tests for KL divergence computation."""
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def test_kl_direction(self):
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"""Test that KL is computed as KL(p_ref || p_cur)."""
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torch.manual_seed(42)
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cur_logits = torch.randn(4, 8) # (B*T, V)
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ref_logits = torch.randn(4, 8)
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kl = _compute_kl_divergence(cur_logits, ref_logits)
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# KL should be non-negative
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assert torch.all(kl >= -1e-6) # Allow small numerical errors
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def test_kl_zero_for_identical(self):
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"""Test that KL is zero when distributions are identical."""
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logits = torch.randn(4, 8)
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kl = _compute_kl_divergence(logits, logits.clone())
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# Should be close to zero
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assert torch.allclose(kl, torch.zeros_like(kl), atol = 1e-5)
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def test_kl_shape(self):
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"""Test KL output shape."""
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cur_logits = torch.randn(2, 4, 8) # (B, T, V)
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ref_logits = torch.randn(2, 4, 8)
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kl = _compute_kl_divergence(cur_logits, ref_logits)
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# Should be flattened to (B*T,)
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assert kl.shape == (8,)
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# -----------------------------------------------------------------------------
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# Test DFT weights computation
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# -----------------------------------------------------------------------------
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class TestDFTWeights:
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"""Tests for DFT weights computation."""
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def test_dft_weights_are_probabilities(self, dummy_logits, dummy_labels):
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"""Test that DFT weights are valid probabilities."""
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flat_logits = dummy_logits.detach().view(-1, 8)
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flat_labels = dummy_labels.view(-1)
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weights = _compute_dft_weights(flat_logits, flat_labels)
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# Weights should be in [0, 1]
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assert torch.all(weights >= 0)
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assert torch.all(weights <= 1)
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def test_dft_weights_are_detached(self, dummy_logits, dummy_labels):
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"""Test that DFT weights are detached (no gradients)."""
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weights = _compute_dft_weights(
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dummy_logits.detach().view(-1, 8),
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dummy_labels.view(-1),
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)
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assert not weights.requires_grad
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# -----------------------------------------------------------------------------
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# A5) Test compute_asft_loss
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# -----------------------------------------------------------------------------
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class TestComputeASFTLoss:
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"""Tests for the main compute_asft_loss function."""
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def test_sft_mode(self, simple_model):
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"""Test SFT mode computes standard CE."""
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inputs = {
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"input_ids": torch.tensor([[1, 2, 3, 4]]),
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"labels": torch.tensor([[1, 2, 3, 4]]),
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}
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loss = compute_asft_loss(simple_model, inputs, asft_mode = "sft", kl_weight = 0.0)
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# Should return a scalar loss
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assert loss.dim() == 0
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assert loss.requires_grad
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def test_dft_mode(self, simple_model):
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"""Test DFT mode."""
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inputs = {
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"input_ids": torch.tensor([[1, 2, 3, 4]]),
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"labels": torch.tensor([[1, 2, 3, 4]]),
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}
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loss = compute_asft_loss(simple_model, inputs, asft_mode = "dft", kl_weight = 0.0)
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assert loss.dim() == 0
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assert loss.requires_grad
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def test_sft_kl_mode(self, simple_model):
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"""Test SFT+KL mode."""
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inputs = {
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"input_ids": torch.tensor([[1, 2, 3, 4]]),
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"labels": torch.tensor([[1, 2, 3, 4]]),
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}
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loss = compute_asft_loss(
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simple_model,
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inputs,
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asft_mode = "sft+kl",
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kl_weight = 0.1,
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reference_policy = "frozen_copy",
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)
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assert loss.dim() == 0
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assert loss.requires_grad
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def test_asft_mode(self, simple_model):
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"""Test full ASFT mode."""
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inputs = {
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"input_ids": torch.tensor([[1, 2, 3, 4]]),
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"labels": torch.tensor([[1, 2, 3, 4]]),
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}
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loss = compute_asft_loss(
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simple_model,
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inputs,
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asft_mode = "asft",
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kl_weight = 0.1,
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reference_policy = "frozen_copy",
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)
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assert loss.dim() == 0
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assert loss.requires_grad
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def test_return_outputs(self, simple_model):
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"""Test return_outputs=True."""
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inputs = {
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"input_ids": torch.tensor([[1, 2, 3, 4]]),
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"labels": torch.tensor([[1, 2, 3, 4]]),
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}
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loss, outputs = compute_asft_loss(
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simple_model, inputs, asft_mode = "sft", return_outputs = True
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)
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assert loss.dim() == 0
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assert hasattr(outputs, "logits")
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def test_handles_all_ignored_labels(self, simple_model):
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"""Test that all -100 labels returns zero loss."""
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inputs = {
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"input_ids": torch.tensor([[1, 2, 3, 4]]),
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"labels": torch.tensor([[-100, -100, -100, -100]]),
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}
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loss = compute_asft_loss(simple_model, inputs, asft_mode = "sft")
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# Should return zero loss
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assert loss.item() == 0.0
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def test_uses_num_items_in_batch(self, simple_model):
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"""Test that num_items_in_batch is used for normalization."""
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inputs = {
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"input_ids": torch.tensor([[1, 2, 3, 4]]),
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"labels": torch.tensor([[1, 2, 3, 4]]),
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"num_items_in_batch": 2, # Override default
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}
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loss = compute_asft_loss(simple_model, inputs, asft_mode = "sft")
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# Should use the provided n_items
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assert loss.dim() == 0
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def test_packing_boundary_masking(self, simple_model):
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"""Test that packed sequence boundaries are masked."""
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inputs = {
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"input_ids": torch.tensor([[1, 2, 3, 4]]),
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"labels": torch.tensor([[1, 2, 3, 4]]),
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"packed_seq_lengths": torch.tensor([2, 2], dtype = torch.int32),
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}
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loss = compute_asft_loss(simple_model, inputs, asft_mode = "sft")
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# Should handle packing without error
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assert loss.dim() == 0
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# -----------------------------------------------------------------------------
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# Test ASFTStreamingConfig
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# -----------------------------------------------------------------------------
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class TestASFTStreamingConfig:
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"""Tests for ASFTStreamingConfig dataclass."""
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def test_default_values(self):
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"""Test default configuration values."""
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config = ASFTStreamingConfig()
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assert config.enabled is False
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assert config.ref_strategy == "none"
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assert config.ref_microbatch_size is None
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assert config.seq_chunk_size is None
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assert config.kl_token_chunk_size is None
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|
assert config.force_fp32_kl is True
|
|
|
|
def test_custom_values(self):
|
|
"""Test custom configuration values."""
|
|
config = ASFTStreamingConfig(
|
|
enabled = True,
|
|
ref_strategy = "batch_micro",
|
|
ref_microbatch_size = 4,
|
|
seq_chunk_size = 256,
|
|
)
|
|
|
|
assert config.enabled is True
|
|
assert config.ref_strategy == "batch_micro"
|
|
assert config.ref_microbatch_size == 4
|
|
assert config.seq_chunk_size == 256
|
|
|
|
def test_config_immutability_when_none_values(self, simple_model):
|
|
"""Test that streaming_config is not mutated when values are None."""
|
|
config = ASFTStreamingConfig(
|
|
enabled = True,
|
|
ref_strategy = "batch_micro",
|
|
ref_microbatch_size = None, # Should use default without mutation
|
|
)
|
|
original_microbatch = config.ref_microbatch_size
|
|
original_chunk = config.seq_chunk_size
|
|
|
|
inputs = {
|
|
"input_ids": torch.tensor([[1, 2, 3, 4]]),
|
|
"labels": torch.tensor([[1, 2, 3, 4]]),
|
|
}
|
|
|
|
# Call compute_asft_loss with sft mode (doesn't use streaming, but
|
|
# the config should still not be mutated)
|
|
loss = compute_asft_loss(
|
|
simple_model,
|
|
inputs,
|
|
asft_mode = "sft",
|
|
streaming_config = config,
|
|
)
|
|
|
|
# Config should not be mutated
|
|
assert config.ref_microbatch_size == original_microbatch
|
|
assert config.seq_chunk_size == original_chunk
|
|
|
|
|
|
# -----------------------------------------------------------------------------
|
|
# Backward Compatibility Tests
|
|
# -----------------------------------------------------------------------------
|
|
|
|
|
|
class TestBackwardCompatibility:
|
|
"""Tests to ensure ASFT doesn't break existing behavior."""
|
|
|
|
def test_sft_mode_matches_standard_ce(self, simple_model):
|
|
"""Test that SFT mode produces same results as standard CE."""
|
|
torch.manual_seed(42)
|
|
inputs = {
|
|
"input_ids": torch.tensor([[1, 2, 3, 4]]),
|
|
"labels": torch.tensor([[1, 2, 3, 4]]),
|
|
}
|
|
|
|
# Compute ASFT loss in SFT mode
|
|
asft_loss = compute_asft_loss(simple_model, inputs, asft_mode = "sft")
|
|
|
|
# The loss should be a valid scalar
|
|
assert asft_loss.dim() == 0
|
|
assert not torch.isnan(asft_loss)
|
|
assert not torch.isinf(asft_loss)
|
|
|
|
def test_streaming_equivalence(self, simple_model):
|
|
"""Test that streaming produces equivalent results to full forward."""
|
|
inputs = {
|
|
"input_ids": torch.tensor([[1, 2, 3, 4]]),
|
|
"labels": torch.tensor([[1, 2, 3, 4]]),
|
|
}
|
|
|
|
# Full forward
|
|
full_loss = compute_asft_loss(
|
|
simple_model,
|
|
inputs,
|
|
asft_mode = "sft+kl",
|
|
kl_weight = 0.1,
|
|
reference_policy = "frozen_copy",
|
|
streaming_config = ASFTStreamingConfig(enabled = False),
|
|
)
|
|
|
|
# With batch_micro streaming (should be equivalent for batch=1)
|
|
streaming_loss = compute_asft_loss(
|
|
simple_model,
|
|
inputs,
|
|
asft_mode = "sft+kl",
|
|
kl_weight = 0.1,
|
|
reference_policy = "frozen_copy",
|
|
streaming_config = ASFTStreamingConfig(
|
|
enabled = True,
|
|
ref_strategy = "batch_micro",
|
|
ref_microbatch_size = 1,
|
|
),
|
|
)
|
|
|
|
# Should be very close
|
|
assert torch.allclose(full_loss, streaming_loss, atol = 1e-4)
|
|
|
|
|
|
# -----------------------------------------------------------------------------
|
|
# Integration Tests
|
|
# -----------------------------------------------------------------------------
|
|
|
|
|
|
class TestASFTTrainerIntegration:
|
|
"""Integration tests for ASFTTrainer."""
|
|
|
|
def test_import_asft_trainer(self):
|
|
"""Test that ASFTTrainer can be imported."""
|
|
from unsloth.trainer import ASFTTrainer, ASFTStreamingConfig
|
|
|
|
assert ASFTTrainer is not None
|
|
assert ASFTStreamingConfig is not None
|
|
|
|
def test_asft_trainer_inherits_unsloth_trainer(self):
|
|
"""Test that ASFTTrainer inherits from UnslothTrainer."""
|
|
from unsloth.trainer import ASFTTrainer, UnslothTrainer
|
|
|
|
assert issubclass(ASFTTrainer, UnslothTrainer)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
pytest.main([__file__, "-v"])
|