  explicit DenseBincountOp(OpKernelConstruction* ctx) : OpKernel(ctx) {
    OP_REQUIRES_OK(ctx, ctx->GetAttr("binary_output", &binary_output_));
  }
  explicit DenseBincountOp(OpKernelConstruction* ctx) : OpKernel(ctx) {
    OP_REQUIRES_OK(ctx, ctx->GetAttr("binary_output", &binary_output_));
  }