GB0067

Graph-Break Type

Short name describing what triggered the graph break

HOP: Unsafe side effect

Values or code snippet captured at the break point

Attempted to mutate {item}

Explanation of why the graph break was triggered

Mutating a variable from outside the scope of this HOP is not supported.

Hints on how to resolve the graph break

If the HOP is activation checkpointing (torch.utils.checkpoint.checkpoint), this points to a
side effect in forward method. Eager activation checkpointing replays that side-effect while
recomputing the forward in the backward. If you are ok with side-effect not replayed in the
backward, try setting torch._dynamo.config.skip_fwd_side_effects_in_bwd_under_checkpoint = True