enable vm runtime by default (#506)

Co-authored-by: Xiaoyu Xu <[email protected]>

src/onediff/infer_compiler/with_oneflow_compile.py

@@ -367,6 +367,7 @@ def __init__(self, model):
         self.config.enable_cudnn_conv_heuristic_search_algo(False)
         self.config.allow_fuse_add_to_output(True)
 
+        os.environ["ONEFLOW_RUN_GRAPH_BY_VM"] = "1"
         os.environ["ONEFLOW_GRAPH_DELAY_VARIABLE_OP_EXECUTION"] = "1"
         os.environ["ONEFLOW_MLIR_CSE"] = "1"
         os.environ["ONEFLOW_MLIR_ENABLE_INFERENCE_OPTIMIZATION"] = "1"