// model.
table SubGraph {
  // A list of all tensors used in this subgraph.
  tensors:[Tensor];

  // Indices of the tensors that are inputs into this subgraph. Note this is
  // the list of non-static tensors that feed into the subgraph for inference.
  inputs:[int];

  // Indices of the tensors that are outputs out of this subgraph. Note this is
  // the list of output tensors that are considered the product of the

    std::vector<int> tensors;  // The tensors that are used (input or output) by
                               // this operation. They needn't correspond to
                               // tensors in the TF graph -- we may add fake
                               // tensors to model memory consumed in addition
                               // to input and output tensors. This vector is

// model.
table SubGraph {
  // A list of all tensors used in this subgraph.
  tensors:[Tensor];

  // Indices of the tensors that are inputs into this subgraph. Note this is
  // the list of non-static tensors that feed into the subgraph for inference.
  inputs:[int];

  // Indices of the tensors that are outputs out of this subgraph. Note this is
  // the list of output tensors that are considered the product of the

    }

    tensors.emplace_back(
        device_->GetAllocator(tensorflow::AllocatorAttributes()), expr.dtype(),
        shape_or.value());

    tensorflow::Tensor& tensor = tensors.back();
    tensorflow::XlaExpression::AssignExpressionToTensor(expr, &tensor);
    inputs.emplace_back(&tensor);
  }

  return success();
}

    for (const TensorHandlePtr& tensor : tensors_) {
      result.emplace_back(tensor.get());
    }
    return result;
  }

 private:
  ParallelTensor(const ParallelDevice& device,
                 std::vector<TensorHandlePtr> tensors,
                 absl::Span<const int64_t> shape, const TF_DataType dtype)
      : device_(device),
        tensors_(std::move(tensors)),

    }
  }

  // Returns whether any tensor in a list of tensors is being watched and has
  // a trainable dtype.
  bool ShouldRecord(absl::Span<const int64_t> tensor_ids,
                    absl::Span<const tensorflow::DataType> dtypes) const;

  // Adds this tensor to the list of watched tensors.
  //
  // This is a no-op if the tensor is already being watched either from an

def TFR_CastOp : TFR_Op<"cast", [Pure]> {
  let description = [{
    The `cast` operation converts the operand with built-in tensor type to
    tfr.tensor type, or vice versa.

    Example:

    ```mlir
    %1 = tfr.cast(%0) : tensor<f32> -> !tfr.tensor
    %3 = tfr.cast(%1) : !tfr.tensor -> tensor<f32>
    ```
  }];

  let arguments = (ins TFR_singleTensorType:$arg);

// some input tensors are not on that device.
// LINT.IfChange
// Note: Keep in sync with internal copy of enum in eager/context.h.
typedef enum TFE_ContextDevicePlacementPolicy {
  // Running operations with input tensors on the wrong device will fail.
  TFE_DEVICE_PLACEMENT_EXPLICIT = 0,
  // Copy the tensor to the right device but log a warning.
  TFE_DEVICE_PLACEMENT_WARN = 1,

                                       std::vector<Tensor>* x_datas,
                                       std::vector<Tensor>* jacobian_ts) {
  size_t y_num = y_shapes.size();
  size_t x_num = x_shapes.size();
  // x_stride and y_stride are used to calculate the correct jacobian row and
  // column position for a pair of elements at positions r, c within the x and y
  // tensors respectively.

) -> _SignatureDefMap:
  """Validates if the tensor names in signatures are consistent with the graph.

  This function checks if the input and output tensor names in the signatures
  exist if the graph. The output tensor names might change during conversion,
  we try to fix that with `_restore_output_tensor_names`. Besides, if there
  are duplicated tensor names, they we will be prefixed with the signature name.