return failure();
  }
  return success();
}

// Check if we can move TPUCopyWithDynamicShapeOp out of a launch. This is the
// case if its results aren't used by other ops except for the return op.
bool CanMove(Operation* op) {
  auto launch_op = llvm::dyn_cast<tf_device::LaunchOp>(op->getParentOp());
  if (!launch_op) return false;
  for (Value result : op->getResults()) {
    for (Operation* user : result.getUsers()) {

  if (Type() == DT_STRING && NumElements() > 0) {
    TF_TString* data = static_cast<TF_TString*>(Data());
    if (CanMove() && data != nullptr) {
      for (int64_t i = 0; i < NumElements(); ++i) {
        TF_TString_Dealloc(&data[i]);
      }
    }
  }
  delete this;
}

bool TensorInterface::CanMove() const {
  // It is safe to move the Tensor if and only if we own the unique reference to