code: def argmin(attrs, inputs, proto_obj):
      
      axis = attrs.get('axis', 0)
      keepdims = attrs.get('keepdims', 1)
      argmin_op = symbol.argmin(inputs[0], axis=axis, keepdims=keepdims)
      # onnx argmax operator always expects int64 as output type
      cast_attrs = {'dtype': 'int64'}
      return 'cast', cast_attrs, argmin_op
docs: Returns indices of the minimum values along an axis.