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fix(backend): GPU seq_len_cpu mismatch & add dummy tree_cache methods #214

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Merged
merged 1 commit into from
Nov 11, 2025
Merged

fix(backend): GPU seq_len_cpu mismatch & add dummy tree_cache methods #214

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8 changes: 8 additions & 0 deletions src/parallax/sglang/batch_info.py
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Original file line number Diff line number Diff line change
Expand Up @@ -68,11 +68,17 @@ def form_sgl_batch_prefill(
) -> ForwardBatch:
"""Initialize a prefill ScheduleBatch -> ModelWorkerBatch -> ForwardBatch workflow"""
sgl_reqs = transform_requests_to_sglang(requests)

def dummy_evict(*args):
pass

dummy_tree_cache = SimpleNamespace(
page_size=model_runner.server_args.page_size,
device=model_runner.device,
token_to_kv_pool_allocator=model_runner.token_to_kv_pool_allocator,
evictable_size=0,
)
dummy_tree_cache.evict = dummy_evict
schedule_batch = ScheduleBatch.init_new(
reqs=sgl_reqs,
req_to_token_pool=model_runner.req_to_token_pool,
Expand Down Expand Up @@ -116,6 +122,7 @@ def select_batch(
ret.reqs = [origin_batch.reqs[i] for i in keep_indices]
if origin_batch.multimodal_inputs is not None:
ret.multimodal_inputs = [origin_batch.multimodal_inputs[i] for i in keep_indices]
ret.seq_lens_cpu = origin_batch.seq_lens_cpu[keep_indices]
ret.req_pool_indices = origin_batch.req_pool_indices[keep_indices_device]
ret.seq_lens = origin_batch.seq_lens[keep_indices_device]
ret.orig_seq_lens = origin_batch.orig_seq_lens[keep_indices_device]
Expand Down Expand Up @@ -189,6 +196,7 @@ def form_sgl_batch_decode(
# TODO: this is a hack to make the seq_lens correct due to select_batch is not refference running batch's seq_lens
# need to fix this
running_batch.seq_lens[ready_indices] += 1
running_batch.seq_lens_cpu[ready_indices] += 1
running_batch.orig_seq_lens[ready_indices] += 1

model_worker_batch = ret.get_model_worker_batch()
Expand Down