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[MCore] Add SiTU-GLU activation fallbacks #6636

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harryzhou2000 wants to merge 3 commits into from
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[MCore] Add SiTU-GLU activation fallbacks #6636

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b707071
[MCore] Add SiTU-GLU activation fallbacks
harryzhou2000 Aug 18, 2026
6d62c6c
[MCore] Address SiTU-GLU lint issues
harryzhou2000 Aug 19, 2026
b92cec1
[MCore] Prefer native TE SiTU-GLU operations
harryzhou2000 Aug 19, 2026
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11 changes: 10 additions & 1 deletion megatron/core/extensions/transformer_engine.py
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Original file line number Diff line number Diff line change
Expand Up @@ -614,7 +614,16 @@ def __new__(cls, config: TransformerConfig):
activation_func_kwargs = {}
if config.activation_func_fp8_input_store:
activation_func_kwargs["cache_quantized_input"] = True
layer = layer_type(**activation_func_kwargs)
if config.use_situ_glu:
from megatron.core.fusions.cutedsl_situ_glu import make_situ_glu

layer = make_situ_glu(
beta1=config.situ_glu_beta1,
beta2=config.situ_glu_beta2,
**activation_func_kwargs,
)
else:
layer = layer_type(**activation_func_kwargs)
return layer

else:
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