4b8bc52424
* fix: correct total_num_steps and batch_size calculation with context parallelism * feat: add test for CP batch size --------- Co-authored-by: NanoCode012 <nano@axolotl.ai>
57 lines
1.7 KiB
Python
57 lines
1.7 KiB
Python
"""Tests for batch_size calculation with context parallelism."""
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import sys
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import types
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import pytest
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from axolotl.utils.config import normalize_config, validate_config
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from axolotl.utils.dict import DictDefault
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@pytest.fixture(name="cp_base_cfg")
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def fixture_cp_base_cfg(min_base_cfg):
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return (
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DictDefault(
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micro_batch_size=2,
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gradient_accumulation_steps=4,
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sequence_len=2048,
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num_epochs=1,
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flash_attention=True,
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)
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| min_base_cfg
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)
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class TestContextParallelBatchSize:
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"""Verify batch_size scales by effective dp world_size when using context parallelism."""
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@pytest.mark.parametrize(
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"world_size, context_parallel_size, expected_batch_size",
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[
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(4, 1, 32), # no CP: 2*4*4 = 32
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(4, 2, 16), # CP=2: 2*4*(4//2) = 16
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(4, 4, 8), # CP=4: 2*4*(4//4) = 8
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(2, 2, 8), # CP=ws: 2*4*(2//2) = 8 (no scaling)
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],
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)
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def test_batch_size_with_context_parallelism(
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self,
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cp_base_cfg,
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monkeypatch,
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world_size,
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context_parallel_size,
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expected_batch_size,
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):
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monkeypatch.setenv("WORLD_SIZE", str(world_size))
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# Mock ring_flash_attn since it's not installable on CPU,
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# but required by schema validation when context_parallel_size > 1.
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if "ring_flash_attn" not in sys.modules:
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monkeypatch.setitem(
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sys.modules, "ring_flash_attn", types.ModuleType("ring_flash_attn")
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)
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cp_base_cfg["context_parallel_size"] = context_parallel_size
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cfg = validate_config(cp_base_cfg)
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normalize_config(cfg)
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assert cfg.batch_size == expected_batch_size
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