[diffusion] CI: minor refactor CI for less code duplication (#13905)

python/sglang/multimodal_gen/configs/pipeline_configs/base.py

@@ -105,7 +105,7 @@ def shard_rotary_emb_for_sp(emb):
 class PipelineConfig:
     """The base configuration class for a generation pipeline."""
 
-    task_type: ModelTaskType
+    task_type: ModelTaskType = ModelTaskType.I2I
 
     model_path: str = ""
     pipeline_config_path: str | None = None

python/sglang/multimodal_gen/configs/sample/base.py

@@ -318,6 +318,12 @@ class SamplingParams:
 
         return sampling_params
 
+    def output_size_str(self) -> str:
+        return f"{self.width}x{self.height}"
+
+    def seconds(self) -> float:
+        return self.num_frames / self.fps
+
     @staticmethod
     def add_cli_args(parser: Any) -> Any:
         """Add CLI arguments for SamplingParam fields"""