[Model] Support IQuest-Coder-40B-Loop (#16348)

Co-authored-by: yxing <yxing@iquestlab.com>
Co-authored-by: yzhu <yzhu@ubiquant.com>
Co-authored-by: zelong518 <zelonghuang02@gmail.com>

python/sglang/srt/model_executor/model_runner.py

@@ -485,6 +485,12 @@ class ModelRunner(ModelRunnerKVCacheMixin):
         self.start_layer = getattr(self.model, "start_layer", 0)
         self.end_layer = getattr(self.model, "end_layer", model_num_layers)
         self.num_effective_layers = self.end_layer - self.start_layer
+
+        # For LoopCoder models, each loop has its own layer_id, so we need to multiply by loop_num
+        loop_num = getattr(self.model_config.hf_config, "loop_num", 1)
+        if loop_num > 1:
+            self.num_effective_layers = self.num_effective_layers * loop_num
+
         assert (
             (not model_has_mtp_layers)
             or (self.spec_algorithm.is_none())