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feat: allow output_hidden_states and output_attensions to record outputs of specific layers #43213

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feat: allow output_hidden_states and output_attensions to record outputs of specific layers #43213

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feat: allow output_hidden_states and output_attensions to record outp…
cloudhan Jan 10, 2026
25a8fac
Merge branch 'main' into record-specified-layers-only
cloudhan Jan 22, 2026
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33 changes: 25 additions & 8 deletions src/transformers/utils/generic.py
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Original file line number Diff line number Diff line change
Expand Up @@ -857,6 +857,7 @@ class OutputRecorder:
index: int = 0
layer_name: str | None = None
class_name: str | None = None
layer_index: list[int] | None = None


def check_model_inputs(func=None, *, tie_last_hidden_states=True):
Expand Down Expand Up @@ -935,19 +936,26 @@ def wrapper(self, *args, **kwargs):
collected_outputs = defaultdict(tuple)
monkey_patched_layers = []

def make_capture_wrapper(module, orig_forward, key, index):
def make_capture_wrapper(module, orig_forward, key, spec):
index = spec.index
layer_index = spec.layer_index

def optionally_append(outputs, new_output):
if layer_index is None:
outputs += (new_output,)
else:
outputs += (new_output,) if len(outputs) in layer_index else (None,)
return outputs

@wraps(orig_forward)
def wrapped_forward(*args, **kwargs):
if key == "hidden_states" and len(collected_outputs[key]) == 0:
collected_outputs[key] += (args[0],)
output = orig_forward(*args, **kwargs)
if not isinstance(output, tuple):
collected_outputs[key] += (output,)
collected_outputs[key] = optionally_append(collected_outputs[key], output)
elif output[index] is not None:
if key not in collected_outputs:
collected_outputs[key] = (output[index],)
else:
collected_outputs[key] += (output[index],)
collected_outputs[key] = optionally_append(collected_outputs[key], output[index])
return output

return wrapped_forward
Expand All @@ -964,7 +972,16 @@ def wrapped_forward(*args, **kwargs):
index = 0 if "hidden_states" in key else 1
class_name = None if not isinstance(specs, str) else specs
target_class = specs if not isinstance(specs, str) else None
specs = OutputRecorder(target_class=target_class, index=index, class_name=class_name)
layer_index = (
None
if recordable_keys.get(f"output_{key}") in (True, False)
else recordable_keys.get(f"output_{key}")
)
if isinstance(layer_index, int):
layer_index = [layer_index]
specs = OutputRecorder(
target_class=target_class, index=index, class_name=class_name, layer_index=layer_index
)
capture_tasks.append((key, specs))

for name, module in self.named_modules():
Expand All @@ -977,7 +994,7 @@ def wrapped_forward(*args, **kwargs):
continue
# Monkey patch forward
original_forward = module.forward
module.forward = make_capture_wrapper(module, original_forward, key, specs.index)
module.forward = make_capture_wrapper(module, original_forward, key, specs)
monkey_patched_layers.append((module, original_forward))

try:
Expand Down