// once tf.function can support this.
  llvm::SmallVector<llvm::StringRef, 4> attr_tokens;
  attr.getValue().split(attr_tokens, ",");
  if (attr_tokens.empty()) {
    return fused_func_op_.emitError()
           << kTFImplements << " attribute should be set";
  }

  // Check if the interface matches.
  if (GetCompositeOpName().str() != attr_tokens[0]) {
    return fused_func_op_.emitError()