func.return %0 : tensor<40x40xf32>

// CHECK-LABEL: func @main(%arg0: tensor<40x37xf32>, %arg1: tensor<40x37xf32>) -> tensor<40x40xf32>
// CHECK:      %[[CONST:[0-9]+]] = "tfl.external_const"() <{buffer_index = 3 : i32}> : () -> tensor<40xf32>

      auto buffer_or =
          BuildBuffer(value, not_returned_by_subgraph, buffer_index);
      if (!buffer_or) return false;
      buffers_.push_back(*buffer_or);
    } else {
      buffers_.push_back(empty_buffer_);
    }

    auto tensor_or =
        BuildTensor(value, tensor_name, buffer_index, quant_parameters);
    if (!tensor_or) return false;
    tensors.push_back(*tensor_or);

  }
  return mlir::GetMlirOpNameFromOpCode(op_code);
}

StatusOr<Operation*> BuildExternalConstOp(const tflite::TensorT& tensor,
                                          int32_t buffer_index,
                                          OpBuilder builder, Location loc) {
  TF_ASSIGN_OR_RETURN(mlir::TensorType type,
                      tfl::GetTensorType(tensor, builder,

    DeclareOpInterfaceMethods<TFL_RuntimeVerification>]> {
  let summary = "External const op.";

  let description = [{
    External const op holds a `buffer_index` which points to a constant
    in the flatbuffer.
  }];

  let arguments = (ins I32Attr:$buffer_index);

  let results = (outs AnyTensor:$output);
}

def TFL_Conv2DOp : TFL_ConvOp<"conv_2d", "Convolution", 0,