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Bugfix for Mamba with Chunked-Prefill #2293

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Bugfix for Mamba with Chunked-Prefill #2293

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bc66c18
bugfix
sidsingh-nvidia Nov 18, 2025
2033904
Merge branch 'main' into siddharth/mamba-chunked-prefill-bugfix
sidsingh-nvidia Nov 18, 2025
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3 changes: 2 additions & 1 deletion megatron/core/ssm/mamba_mixer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -486,7 +486,8 @@ def dynamic_inference(self, hidden_states: torch.Tensor, context: DynamicInferen
zxBCdt_chunked_prefill = zxBCdt[
active_token_count - chunked_prefill_request_token_count : active_token_count
]
batch_index_chunked_prefill = batch_indices[context.chunked_prefill_request_id]
pos = torch.where(context.request_ids == context.chunked_prefill_request_id)[0][0]
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@kvareddy kvareddy Nov 19, 2025

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Can we abstract away this extraction in context?

batch_index_chunked_prefill = batch_indices[pos]

y_prefill_chunked = self.ssm_prefill(
zxBCdt_chunked_prefill,
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