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https://github.com/pese-git/llm-arch-research.git
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dc440a3938
- Covers forward pass with and without KV-cache - Verifies correct sequence generation for greedy, top-k, and top-p sampling - Adds ValueError test for exceeding max sequence length - Uses small random toy config and minimal setup for fast test feedback Motivation: Prevent regressions in decoding, sampling, and KV-cache logic in GPT2 implementation.
53 lines
1.5 KiB
Python
53 lines
1.5 KiB
Python
import torch
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import pytest
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from llm.models.gpt.gpt2 import GPT2
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@pytest.fixture
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def config():
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return {
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"vocab_size": 100,
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"embed_dim": 32,
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"num_heads": 4,
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"num_layers": 2,
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"max_position_embeddings": 16,
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"dropout": 0.0,
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}
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@pytest.fixture
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def model(config):
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return GPT2(config)
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def test_forward_basic(model):
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x = torch.randint(0, 100, (2, 8))
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logits, cache = model(x)
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assert logits.shape == (2, 8, 100)
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assert isinstance(cache, list)
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assert len(cache) == model._decoders.__len__()
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def test_forward_with_cache(model):
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x = torch.randint(0, 100, (2, 4))
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logits, cache = model(x, use_cache=True)
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x2 = torch.randint(0, 100, (2, 1))
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logits2, cache2 = model(x2, use_cache=True, cache=cache)
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assert logits2.shape == (2, 1, 100)
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assert isinstance(cache2, list)
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def test_generate_and_shape(model):
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x = torch.randint(0, 100, (1, 5))
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result = model.generate(x, max_new_tokens=3, do_sample=False)
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assert result.shape == (1, 8)
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def test_forward_sequence_too_long(model, config):
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x = torch.randint(0, 100, (1, config["max_position_embeddings"] + 1))
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with pytest.raises(ValueError):
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model(x)
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def test_generate_with_sampling_topk(model):
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x = torch.randint(0, 100, (1, 3))
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out = model.generate(x, max_new_tokens=2, do_sample=True, top_k=5)
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assert out.shape == (1, 5)
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def test_generate_with_sampling_topp(model):
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x = torch.randint(0, 100, (1, 3))
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out = model.generate(x, max_new_tokens=2, do_sample=True, top_p=0.8)
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assert out.shape == (1, 5) |