fx: Update fx.rst (#68043)
Summary:
When I run this part of the code on the document with PyTorch version 1.10.0, I found some differences between the output and the document, as follows:
```python
import torch
import torch.fx as fx
class M(torch.nn.Module):
def forward(self, x, y):
return x + y
# Create an instance of `M`
m = M()
traced = fx.symbolic_trace(m)
print(traced)
print(traced.graph)
traced.graph.print_tabular()
```
I get the result：
```shell
def forward(self, x, y):
add = x + y; x = y = None
return add
graph():
%x : [#users=1] = placeholder[target=x]
%y : [#users=1] = placeholder[target=y]
%add : [#users=1] = call_function[target=operator.add](args = (%x, %y), kwargs = {})
return add
opcode name target args kwargs
------------- ------ ----------------------- ------ --------
placeholder x x () {}
placeholder y y () {}
call_function add <built-in function add> (x, y) {}
output output output (add,) {}
```
This pr modified the document。
Pull Request resolved: https://github.com/pytorch/pytorch/pull/68043
Reviewed By: driazati
Differential Revision: D32287178
Pulled By: jamesr66a
fbshipit-source-id: 48ebd0e6c09940be9950cd57ba0c03274a849be5
