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mxnet.contrib.onnx._export .export_model( sym, params, input_shape, output)
Exports a given MXNet symbol object file or path to saved file to ONNX model file.
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params - str object (path to params file) or dict object containing the model params
input_shape - list of tuple object , specifies the shape of each input to the model
output - path to the output file, including the filename. Default: current path , filename: model.onnx
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