tensorflow/core/ops/compat/ops_history_v1/Substr.pbtxt

op {
  name: "Substr"
  input_arg {
    name: "input"
    type: DT_STRING
  }
  input_arg {
    name: "pos"
    type_attr: "T"
  }
  input_arg {
    name: "len"
    type_attr: "T"
  }
  output_arg {
    name: "output"
    type: DT_STRING
  }
  attr {
    name: "T"
    type: "type"
    allowed_values {
      list {
        type: DT_INT32
        type: DT_INT64
      }
    }
  }
}
op {
  name: "Substr"
  input_arg {
    name: "input"
    type: DT_STRING
  }
  input_arg {
    name: "pos"
    type_attr: "T"
  }
  input_arg {
    name: "len"
    type_attr: "T"
  }
  output_arg {
    name: "output"
    type: DT_STRING
  }
  attr {
    name: "T"
    type: "type"
    allowed_values {
      list {
        type: DT_INT32
        type: DT_INT64
      }
    }
  }
  attr {
    name: "unit"
    type: "string"
    default_value {
      s: "BYTE"
    }
    allowed_values {
      list {
        s: "BYTE"
        s: "UTF8_CHAR"
      }
    }
  }
}