static bool IsQuantizableCustomOp(Operation* op,
                                    const CustomMap& custom_op_map) {
    return false;
  }

  // All the quantized ops are supported if the quantization method is dynamic
  // range quantization.
  static bool AllowDynamicRangeQuantizedOperand(
      Operation* quantized_op, const CustomMap& custom_op_map) {
    auto call_op = cast<TF::PartitionedCallOp>(quantized_op);

using RequiredSameOperandsAndResultsScaleFunc = std::function<bool(bool, int)>;
// bool RequiredSameQuantizedAxes()
using RequiredSameQuantizedAxesFunc = std::function<bool()>;

using CustomMap = quant::CustomOpMap;

// Quantization spec of an op, driving the quantization algorithm.
struct OpQuantSpec {
  // Maps the operand index of a bias input to its quantization specifications,