),
              tensor_spec.TensorSpec(
                  name='y', shape=shapes[1], dtype=dtypes.float32
              ),
          ]
      )
      def matmul_without_kernel(
          self, x: core.Tensor, y: core.Tensor
      ) -> Mapping[str, core.Tensor]:
        return self._matmul(x, y)

      def _matmul(self, x, y):
        x = array_ops.fake_quant_with_min_max_vars(