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[Session R3] Add routed_experts_start_len for absolute routing slice control (#24851)

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Co-authored-by: Byron Hsu <byron@periodiclabs.ai>
Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: zyzshishui <zyzshishui@gmail.com>
Co-authored-by: Yuzhen Zhou <82826991+zyzshishui@users.noreply.github.com>
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Byron Hsu
2026-05-10 10:04:43 -07:00
committed by GitHub
co-authored by Byron Hsu Cursor zyzshishui Yuzhen Zhou
parent 9150e77399
commit d82e339ce2
16 changed files with 288 additions and 11 deletions
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docs_new/docs/basic_usage/openai_api_completions.ipynb
+2 -2
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@@ -374,7 +374,7 @@
"source": [
"#### Returning Routed Experts (MoE Models)\n",
"\n",
"For MoE models, set `return_routed_experts: true` in `extra_body` to return expert routing data. Requires `--enable-return-routed-experts` server flag. The `routed_experts` field will be returned in the `sgl_ext` object on each choice, containing base64-encoded int32 expert IDs as a flattened array with logical shape `[num_tokens, num_layers, top_k]`."
"For MoE models, set `return_routed_experts: true` in `extra_body` to return expert routing data. Requires `--enable-return-routed-experts` server flag. The `routed_experts` field will be returned in the `sgl_ext` object on each choice, containing base64-encoded int32 expert IDs as a flattened array with logical shape `[num_tokens, num_layers, top_k]`. By default this returns `[0, seqlen - 1)`, the full available sequence, because RL workflows need routed experts for the full sequence. Set `routed_experts_start_len` in `extra_body` to an absolute prefix length to return only `[routed_experts_start_len, seqlen - 1)`. For example, in multi-turn RL rollouts, routed experts for tokens from previous turns have already been collected, so setting this value avoids unnecessary transfer that cause bottlenecks."
]
},
{
@@ -468,7 +468,7 @@
"source": [
"#### Returning Routed Experts (MoE Models)\n",
"\n",
"For MoE models, set `return_routed_experts: true` in `extra_body` to return expert routing data. Requires `--enable-return-routed-experts` server flag. The `routed_experts` field will be returned in the `sgl_ext` object on each choice, containing base64-encoded int32 expert IDs as a flattened array with logical shape `[num_tokens, num_layers, top_k]`."
"For MoE models, set `return_routed_experts: true` in `extra_body` to return expert routing data. Requires `--enable-return-routed-experts` server flag. The `routed_experts` field will be returned in the `sgl_ext` object on each choice, containing base64-encoded int32 expert IDs as a flattened array with logical shape `[num_tokens, num_layers, top_k]`. By default this returns `[0, seqlen - 1)`, the full available sequence, because RL workflows need routed experts for the full sequence. Set `routed_experts_start_len` in `extra_body` to an absolute prefix length to return only `[routed_experts_start_len, seqlen - 1)`. For example, in multi-turn RL rollouts, routed experts for tokens from previous turns have already been collected, so setting this value avoids unnecessary transfer that cause bottlenecks."
]
},
{