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+# Qwen3.5-9B GRPO on MedQA-USMLE-4-options.
+#
+# Notes specific to Qwen3.5 as a vision-language model in PRIME-RL:
+#   - max_async_level = 1 + filesystem weight broadcast: the NCCL broadcaster
+#     fails to initialize on the 9B VLM (init_broadcaster 500). Filesystem
+#     broadcast is reliable and `maybe_clean` keeps only async_level+1 = 2
+#     broadcast dirs on disk during the run.
+#   - optim_cpu_offload = true: needed to fit FSDP + optimizer state into
+#     2 train GPUs at seq_len=8192. Without it, OOMs on H100.
+#   - Do NOT enable [trainer.model.compile]: silently hangs on the 9B VLM
+#     during the first forward pass.
+#   - enable_thinking must be passed through chat_template_kwargs in BOTH
+#     the orchestrator sampling block and the eval sampling block — Qwen3.5
+#     is an instruct model that requires the flag to emit <think> tokens.
+#
+# 8 GPUs total: 2 train (FSDP) + 5 inference (dp=5) + 1 free for an external
+# judge server (medqa itself doesn't need a judge; this layout matches the
+# eval-time setup that adds judge-scored open-ended benches).
+
+max_steps = 100
+seq_len = 8192
+max_async_level = 1
+
+[model]
+name = "Qwen/Qwen3.5-9B"
+
+[weight_broadcast]
+type = "filesystem"
+
+[orchestrator]
+batch_size = 64
+rollouts_per_example = 8
+max_inflight_rollouts = 128
+
+[orchestrator.sampling]
+max_tokens = 8192
+extra_body = { chat_template_kwargs = { enable_thinking = true } }
+
+[orchestrator.buffer]
+online_difficulty_filtering = true
+easy_threshold = 1.0
+hard_threshold = 0.0
+
+[[orchestrator.env]]
+id = "medqa"
+name = "medqa"
+args = { shuffle_answers = true }
+
+[orchestrator.eval]
+interval = 50
+
+[orchestrator.eval.sampling]
+max_tokens = 12288
+extra_body = { chat_template_kwargs = { enable_thinking = true } }
+
+[[orchestrator.eval.env]]
+id = "medqa"
+name = "medqa"
+args = { shuffle_answers = false }
+num_examples = 200
+rollouts_per_example = 1
+
+[[orchestrator.eval.env]]
+id = "medbullets"
+name = "medbullets"
+args = { shuffle_answers = false }
+num_examples = 100
+rollouts_per_example = 1
+
+[[orchestrator.eval.env]]
+id = "metamedqa"
+name = "metamedqa"
+args = { shuffle_answers = false }
+num_examples = 100
+rollouts_per_example = 1
+
+[[orchestrator.eval.env]]
+id = "head-qa"
+name = "head-qa"
+args = { shuffle_answers = false }
+num_examples = 50
+rollouts_per_example = 1
+
+[trainer.model]
+name = "Qwen/Qwen3.5-9B"
+attn = "flash_attention_3"
+seq_len = 8192
+optimization_dtype = "bfloat16"
+reduce_dtype = "bfloat16"
+dp_replicate = 1
+reshard_after_forward = true
+optim_cpu_offload = true
+
+[trainer.model.ac]
+freq = 1
+
+[trainer.optim]
+lr = 1.5e-6
+
+[ckpt]
+interval = 50
+resume_step = -1
+
+[deployment]
+type = "single_node"
+num_train_gpus = 2
+num_infer_gpus = 5
+
+[inference]
+gpu_memory_utilization = 0.90
+
+[inference.parallel]
+dp = 5
+
+[inference.model]
+max_model_len = 24576
+dtype = "bfloat16"