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Test Mosaic Tutorial Post 2.11 #3809

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1cf72d3
Test Mosaic Tutorial Post 2.11
sekyondaMeta Mar 30, 2026
3c8fc59
Update validate_tutorials_built.py
sekyondaMeta Mar 30, 2026
6e486af
Fix activation checkpointing crash by using use_reentrant=False
sekyondaMeta Apr 1, 2026
c473f6a
Merge branch 'main' into test_mosaic_tutorial_2.11
sekyondaMeta Apr 1, 2026
f92d01b
Revert "Fix activation checkpointing crash by using use_reentrant=False"
sekyondaMeta Apr 1, 2026
2eaef42
Disable dropout to workaround PyTorch 2.11 checkpoint recomputation bug
sekyondaMeta Apr 1, 2026
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2 changes: 1 addition & 1 deletion .jenkins/validate_tutorials_built.py
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Original file line number Diff line number Diff line change
Expand Up @@ -39,7 +39,7 @@
"intermediate_source/tensorboard_profiler_tutorial", # reenable after 2.0 release.
"advanced_source/semi_structured_sparse", # reenable after 3303 is fixed.
"intermediate_source/torchrec_intro_tutorial.py", #failing with 2.8 reenable after 3498
"beginner_source/mosaic_memory_profiling_tutorial.py", # failing with 2.11 issue #3774
#"beginner_source/mosaic_memory_profiling_tutorial.py", # failing with 2.11 RC issue #3774
]

def tutorial_source_dirs() -> List[Path]:
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8 changes: 7 additions & 1 deletion beginner_source/mosaic_memory_profiling_tutorial.py
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Expand Up @@ -306,7 +306,13 @@ def run_training_ac(

# Load model
print(f"Loading GPT-2 (activation_checkpointing={activation_checkpointing})...")
model = GPT2LMHeadModel.from_pretrained("gpt2")
# Disable dropout to avoid PyTorch 2.11 checkpoint recomputation bug (#3774).
# _VF.dropout returns NULL without setting an exception during backward
# recomputation of GPT2Block. Dropout is irrelevant to memory profiling.
# Original: model = GPT2LMHeadModel.from_pretrained("gpt2")
model = GPT2LMHeadModel.from_pretrained(
"gpt2", resid_pdrop=0, attn_pdrop=0, embd_pdrop=0
)

if activation_checkpointing:
model.gradient_checkpointing_enable()
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