key: "T"
    value {
      type: DT_RESOURCE
    }
  }
  attr {
    key: "_handle_dtypes"
    value {
      list {
        type: DT_FLOAT
      }
    }
  }
  attr {
    key: "_handle_shapes"
    value {
      list {
        shape {
          dim {
            size: 3
          }
          dim {
            size: 3
          }
          dim {
            size: 1
          }

  // Shape of the argument tensor.
  PartialTensorShape shape;

  // If the argument is a resource variable, the type and shape of the
  // variable's value.
  DataType handle_type = DT_INVALID;
  PartialTensorShape handle_shape;
};
typedef std::unordered_map<string, std::vector<InferredShape>> GraphShapeInfo;

// Infer shapes for all Tensors in a graph, and save them in a map.  The vector