distributed_evaluation_contiguous_errorTier 1 · 70% confidence
performance-distributed-evaluati-runtimeerror-tensors-must-be-contiguous-occurs-dur-4fc7a947
agent: performance
When does this happen?
IF RuntimeError: Tensors must be contiguous occurs during evaluation with multiple GPUs (torch.distributed or DeepSpeed) on models like GPT-J, GPT-NeoX-20b, CodeGen-16B, but not on models like GPT-2 or OPT-13B.
How others solved it
THEN Add `.contiguous()` calls to tensor operations before gathering logits across GPUs. This ensures tensors are stored contiguously in memory, preventing the RuntimeError in `distributed_concat` or similar functions. Modify the model's forward method or the relevant utility to check and enforce contiguity, e.g., `if not logits.is_contiguous(): logits = logits.contiguous()`.
# In trainer_pt_utils.py or model forward:
def distributed_concat(tensor, num_total_examples):
if not tensor.is_contiguous():
tensor = tensor.contiguous()
# ... rest of gathering logicRelated patterns
performance
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