[pytorch] remove tracing logic from gen_variable_factories.py (#39514)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/39514
For methods in `variable_factories.h`, we set `AutoNonVariableTypeMode` guard before dispatching, which also disables tracing as side effort, so we need replicate the tracing logic.
Now as we have created separate TraceType, we should be able to remove tracing from `variable_factories.h`.
Example of old code:
```
inline at::Tensor arange(at::Scalar start, at::Scalar end, at::Scalar step, const at::TensorOptions & options = {}) {
#if !defined(PYTORCH_DISABLE_TRACING)
torch::jit::Node* node = nullptr;
std::shared_ptr<jit::tracer::TracingState> tracer_state;
if (jit::tracer::isTracing()) {
tracer_state = jit::tracer::getTracingState();
at::Symbol op_name;
op_name = jit::Symbol::fromQualString("aten::arange");
node = tracer_state->graph->create(op_name, /*num_outputs=*/0);
jit::tracer::recordSourceLocation(node);
jit::tracer::addInputs(node, "start", start);
jit::tracer::addInputs(node, "end", end);
jit::tracer::addInputs(node, "step", step);
jit::tracer::addInputs(node, "options", options);
tracer_state->graph->insertNode(node);
jit::tracer::setTracingState(nullptr);
}
#endif
at::Tensor tensor = ([&]() {
at::AutoNonVariableTypeMode non_var_type_mode(true);
return at::arange(start, end, step, at::TensorOptions(options));
})();
at::Tensor result =
autograd::make_variable(std::move(tensor), /*requires_grad=*/options.requires_grad());
#if !defined(PYTORCH_DISABLE_TRACING)
if (tracer_state) {
jit::tracer::setTracingState(std::move(tracer_state));
jit::tracer::addOutput(node, result);
}
#endif
return result;
}
```
Example of new code:
```
inline at::Tensor arange(at::Scalar start, at::Scalar end, at::Scalar step, const at::TensorOptions & options = {}) {
at::Tensor tensor = ([&]() {
at::AutoNonVariableTypeMode non_var_type_mode(true);
return at::arange(start, end, step, at::TensorOptions(options));
})();
at::Tensor result =
autograd::make_variable(std::move(tensor), /*requires_grad=*/options.requires_grad());
return result;
}
```
ghstack-source-id: 105407617
Test Plan: CI
Differential Revision: D21880936
fbshipit-source-id: 19a4330eed5bc1ee956ad1c638a9658e7a1ce283