input_arg {
            name: "unknown"
            type: DT_DOUBLE
          }
          output_arg {
            name: "identity"
            type: DT_DOUBLE
          }
        }
        node_def {
          name: "PartitionedCall"
          op: "PartitionedCall"
          input: "unknown"
          attr {
            key: "Tin"
            value {
              list {

*   `uniform_unit_scaling_initializer()` no longer takes a `full_shape` arg,
    instead relying on the partition info passed to the initializer function
    when it's called.
*   The NodeDef protocol message is now defined in its own file `node_def.proto`
    `instead of graph.proto`.
*   `ops.NoGradient` was renamed `ops.NotDifferentiable`. `ops.NoGradient` will
    be removed soon.