Use modern onnx API to load model from file

docs/tutorials/onnx/export_mxnet_to_onnx.md

@@ -121,7 +121,7 @@ from onnx import checker
 import onnx
 
 # Load onnx model
-model_proto = onnx.load(converted_model_path)
+model_proto = onnx.load_model(converted_model_path)
 
 # Check if converted ONNX protobuf is valid
 checker.check_graph(model_proto.graph)

python/mxnet/contrib/onnx/onnx2mx/import_model.py

@@ -50,7 +50,7 @@ def import_model(model_file):
         raise ImportError("Onnx and protobuf need to be installed. "
                           + "Instructions to install - https://github.com/onnx/onnx")
     # loads model file and returns ONNX protobuf object
-    model_proto = onnx.load(model_file)
+    model_proto = onnx.load_model(model_file)
     sym, arg_params, aux_params = graph.from_onnx(model_proto.graph)
     return sym, arg_params, aux_params
 
@@ -81,6 +81,6 @@ def get_model_metadata(model_file):
     except ImportError:
         raise ImportError("Onnx and protobuf need to be installed. "
                           + "Instructions to install - https://github.com/onnx/onnx")
-    model_proto = onnx.load(model_file)
+    model_proto = onnx.load_model(model_file)
     metadata = graph.get_graph_metadata(model_proto.graph)
     return metadata

python/mxnet/contrib/onnx/onnx2mx/import_to_gluon.py

@@ -43,6 +43,6 @@ def import_to_gluon(model_file, ctx):
     except ImportError:
         raise ImportError("Onnx and protobuf need to be installed. Instructions to"
                           + " install - https://github.com/onnx/onnx#installation")
-    model_proto = onnx.load(model_file)
+    model_proto = onnx.load_model(model_file)
     net = graph.graph_to_gluon(model_proto.graph, ctx)
     return net