// The function might contain more stats ops than required, and it will
  // introduce requantize if the calibration stats have conflicts. This method
  // tries to remove all the redundant stats ops.
  bool RemoveRedundantStats(func::FuncOp func);

  // Verify the quantization specification is expected for quantizing the
  // current function.
  bool IsLegalQuantSpecs(func::FuncOp func) {

  // The function might contain more stats ops than required, and it will
  // introduce requantize if the calibration stats have conflicts. This method
  // tries to remove all the redundant stats ops.
  bool RemoveRedundantStats(func::FuncOp func);

  // Verify the quantization specification is expected for quantizing the
  // current function.
  bool IsLegalQuantSpecs(func::FuncOp func) {