ops::tensor_array_concat_v3 shorthand function is broken

[Corallus-Caninus]

tensor_array_concat_v3 doesnt build dtype attribute.

I get:
thread 'layers::test_concat_split' panicked at 'called Result::unwrap() on an Err value: {inner:0x2392837d900, InvalidArgument: NodeDef missing attr 'dtype' from Op<name=TensorArrayConcatV3; signature=handle:resource, flow_in:float -> value:dtype, lengths:int64; attr=dtype:type; attr=element_shape_except0:shape,default=; is_stateful=true>; NodeDef: {{node TensorArrayConcatV3}}}', src\layers.rs:207:58

for:
let group_op = ops::tensor_array_concat_v3(handle_output.clone(), flow_output.clone(), scope)?;
where handle_output and flow_output are the corresponding outputs from a tensorarrayv3

[dskkato]

May be duplicate of #357

[dskkato]

Here is the TensorArrayConcatV3 definition. The output_arg "value" seems to require the dtype attribute indirectly.

op {
  name: "TensorArrayConcatV3"
  input_arg {
    name: "handle"
    type: DT_RESOURCE
  }
  input_arg {
    name: "flow_in"
    type: DT_FLOAT
  }
  output_arg {
    name: "value"
    type_attr: "dtype"
  }
  output_arg {
    name: "lengths"
    type: DT_INT64
  }
  attr {
    name: "dtype"
    type: "type"
  }
  attr {
    name: "element_shape_except0"
    type: "shape"
    default_value {
      shape {
        unknown_rank: true
      }
    }
  }
  is_stateful: true
}