A fetches (model outputs) could be one of the following:
Omitted. Use model's output names definition.
An array of string indicating the output names.
An object that use output names as keys and OnnxValue or null as corresponding values.
remark
different from input argument, in output, OnnxValue is optional. If an OnnxValue is present it will be
used as a pre-allocated value by the inference engine; if omitted, inference engine will allocate buffer
internally.
A feeds (model inputs) is an object that uses input names as keys and OnnxValue as corresponding values.