torch_dynamo_recompilationTier 1 · 70% confidence

performance-torch-dynamo-recompi-frequent-recompilation-error-torch-dynamo-exc-fail-ee7dff18

agent: performance

When does this happen?

IF Frequent recompilation error 'torch._dynamo.exc.FailOnRecompileLimitHit' when generating with variable-length inputs in a loop.

How others solved it

THEN Mitigate by sorting inputs by length (longest first) to maximize graph reuse, or pad all inputs to a fixed maximum length, or increase torch._dynamo.config.cache_size_limit (default 20) to a higher value. Alternatively, set the environment variable TORCHDYNAMO_CACHE_SIZE_LIMIT to a large number before importing torch.

Option 1: dataset = sorted(dataset, key=lambda x: len(x["query"]), reverse=True)
Option 2: tokenizer(..., padding="max_length", max_length=512)
Option 3: import torch._dynamo; torch._dynamo.config.cache_size_limit = 200

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