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0784852 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 | """Scientific contracts for same-function, different-sharing Loop training."""
import copy
import numpy as np
import pytest
import torch
from torch.nn import functional as F
from llm_memory_editability import sequential_transfer as st
from llm_memory_editability.loop_learning import (
ARMS,
architecture_manifest,
construct,
estimate_training_flops,
execution_digest,
)
from llm_memory_editability.realworld_composition import model_digest, optimizer_for, update
@pytest.fixture(autouse=True)
def single_thread():
previous = torch.get_num_threads()
torch.set_num_threads(1)
yield
torch.set_num_threads(previous)
def spec(arm="shared", repeats=3, dropout=0.0):
return {
"arm": arm,
"initialization": 37,
"base_unique_blocks": 2,
"repeats": repeats,
"model": {
"vocab_size": 31,
"positions": 32,
"hidden_size": 8,
"attention_heads": 2,
"dropout": dropout,
},
"microbatch_size": 2,
}
def records():
return [
{"encoded": {"prefix": [1, 2], "target": [3, 30], "input": [1, 2, 3]}},
{"encoded": {"prefix": [4, 5, 6], "target": [7, 30], "input": [4, 5, 6, 7]}},
]
@pytest.mark.parametrize("repeats", [2, 4])
@pytest.mark.parametrize("dropout", [0.0, 0.1])
def test_same_function_initialization_preserves_full_forward_and_random_stream(repeats, dropout):
models = [construct(spec(arm, repeats, dropout), "cpu") for arm in ARMS[:3]]
assert len({execution_digest(model) for model in models}) == 1
tokens = torch.tensor([[1, 2, 3, 4], [5, 6, 7, 8]])
outputs, states = [], []
for model in models:
model.train()
torch.manual_seed(73)
outputs.append(model(tokens))
states.append(torch.get_rng_state())
for output, state in zip(outputs[1:], states[1:], strict=True):
torch.testing.assert_close(output, outputs[0], rtol=0, atol=0)
assert torch.equal(state, states[0])
def test_selected_readout_and_causality_hold_in_every_arm():
tokens = torch.tensor([[1, 2, 3, 4], [5, 6, 7, 8]])
positions = torch.tensor([[1, 2], [0, 2]])
for arm in ARMS:
model = construct(spec(arm), "cpu").eval()
logits = model(tokens)
selected = logits[torch.arange(2)[:, None], positions]
torch.testing.assert_close(model(tokens, positions), selected)
modified = tokens.clone()
modified[:, -1] = 30
torch.testing.assert_close(model(modified)[:, :-1], logits[:, :-1], rtol=0, atol=0)
def test_reference_initialization_does_not_depend_on_arm_or_repeat_depth():
original = construct(spec(), "cpu")
for arm in ARMS:
varied = spec(arm, repeats=4)
varied["base_unique_blocks"] = 4
model = construct(varied, "cpu")
for index in range(2):
for name, tensor in original.transformer.h[index].state_dict().items():
torch.testing.assert_close(
model.transformer.h[index].state_dict()[name], tensor, rtol=0, atol=0
)
for module in ("wte", "wpe", "ln_f"):
for name, tensor in getattr(original.transformer, module).state_dict().items():
torch.testing.assert_close(
getattr(model.transformer, module).state_dict()[name], tensor, rtol=0, atol=0
)
assert architecture_manifest(model)["initialization_reference_layers"] == 8
def test_storage_sharing_and_executed_depth_are_counted_separately():
models = {arm: construct(spec(arm), "cpu") for arm in ARMS}
reports = {arm: architecture_manifest(model) for arm, model in models.items()}
shared, untied, partial, shallow = [reports[arm] for arm in ARMS]
assert shared["unique_parameters"] == shallow["unique_parameters"]
assert shared["unique_parameters"] < partial["unique_parameters"] < untied["unique_parameters"]
assert [reports[arm]["executed_blocks"] for arm in ARMS] == [6, 6, 6, 2]
assert [reports[arm]["unique_mlp_modules"] for arm in ARMS] == [2, 6, 2, 2]
assert [reports[arm]["unique_attention_modules"] for arm in ARMS] == [2, 6, 6, 2]
blocks = models["mlp_shared"].transformer.h
assert blocks[0].mlp is blocks[2].mlp is blocks[4].mlp
assert blocks[0].ln_2 is not blocks[2].ln_2
assert blocks[0].attn is not blocks[2].attn
for model in models.values():
optimizer = optimizer_for(model, 0.001, 0.1)
parameters = [p for group in optimizer.param_groups for p in group["params"]]
assert len(parameters) == len({id(parameter) for parameter in parameters})
assert (
sum(p.numel() for p in parameters) == architecture_manifest(model)["unique_parameters"]
)
@pytest.mark.parametrize("arm", ["shared", "mlp_shared"])
def test_shared_gradient_equals_sum_over_independent_occurrences(arm):
shared = construct(spec(arm), "cpu").double()
untied = construct(spec("untied"), "cpu").double()
tokens = torch.tensor([[1, 2, 3, 4], [5, 6, 7, 8]])
labels = torch.tensor([[2, 3, 4, 30], [6, 7, 8, 30]])
for model in (shared, untied):
F.cross_entropy(model(tokens).flatten(0, 1), labels.flatten()).backward()
for block_index, block in enumerate(shared.transformer.h):
for name, parameter in block.named_parameters():
occurrences = (
[block_index % 2 + 2 * repeat for repeat in range(3)]
if arm == "shared" or name.startswith("mlp.")
else [block_index]
)
expected = sum(
dict(untied.transformer.h[index].named_parameters())[name].grad
for index in occurrences
)
torch.testing.assert_close(parameter.grad, expected, rtol=1e-11, atol=1e-12)
independent_parameters = dict(untied.named_parameters())
for name, parameter in shared.named_parameters():
if not name.startswith("transformer.h."):
torch.testing.assert_close(
parameter.grad, independent_parameters[name].grad, rtol=1e-11, atol=1e-12
)
@pytest.mark.parametrize("arm", ARMS)
def test_checkpoint_restores_sharing_and_exact_optimizer_rng_continuation(tmp_path, arm):
run_spec = spec(arm, dropout=0.1)
model = construct(run_spec, "cpu")
optimizer = optimizer_for(model, 0.001, 0.1)
update(model, optimizer, records(), run_spec, "cpu", 30)
checkpoint = tmp_path / "resume.pt"
manifest = {"plan_sha256": "same-plan"}
st.save_checkpoint(
checkpoint, model, optimizer, 1, np.ones(2, dtype=np.int64), {}, [], manifest
)
before = architecture_manifest(model)
update(model, optimizer, records(), run_spec, "cpu", 30)
restored = construct(run_spec, "cpu")
restored_optimizer = optimizer_for(restored, 0.001, 0.1)
st.restore_checkpoint(checkpoint, restored, restored_optimizer, manifest)
assert architecture_manifest(restored) == before
update(restored, restored_optimizer, records(), run_spec, "cpu", 30)
assert model_digest(restored) == model_digest(model)
if arm == "mlp_shared":
assert restored.transformer.h[0].mlp is restored.transformer.h[2].mlp
if arm == "untied":
assert restored.transformer.h[0].mlp is not restored.transformer.h[2].mlp
assert not torch.equal(
restored.transformer.h[0].mlp.c_proj.weight,
restored.transformer.h[2].mlp.c_proj.weight,
)
def test_flops_use_executed_depth_and_match_existing_training_accounting():
estimates = {}
for arm in ARMS:
model = construct(spec(arm), "cpu")
optimizer = optimizer_for(model, 0.001, 0.1)
result = update(model, optimizer, records(), spec(arm), "cpu", 30)
estimates[arm] = estimate_training_flops(model, 16, 4, 128)
assert estimates[arm] == result["estimated_matmul_training_flops"]
assert estimates["shared"] == estimates["untied"] == estimates["mlp_shared"]
assert estimates["shallow"] < estimates["shared"]
@pytest.mark.parametrize(
"change",
[
{"arm": "unknown"},
{"base_unique_blocks": 0},
{"repeats": 0},
{"initialization_reference_layers": 1},
],
)
def test_invalid_intervention_is_rejected(change):
run_spec = copy.deepcopy(spec())
run_spec.update(change)
with pytest.raises(ValueError):
construct(run_spec, "cpu")
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