[JIT] Optionally validate nvfuser outputs after execution (#74361)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/74361
This adds an optional validation after executing an NVFuser node, which checks that the output is the same as the unfused implementation. Then the outputs and the graph are reported via a callback.
```python
import torch
def callback(x, y, graph):
for i in range(len(x)-amt, len(x)):
print(x[i])
print(y[i])
print(graph)
with torch.jit.fuser("fuser2"):
torch._C._jit_nvfuser_set_comparison_callback(True, callback)
torch.jit.script
def g(x, y):
z = torch.add(x, y)
return torch.sin(z)
def f(x, y, a):
z = torch.add(x, y)
return g(torch.relu(z), a)
f_s = torch.jit.script(f)
x = torch.rand((10, 10), dtype=torch.half).cuda()
y = torch.rand((10, 10), dtype=torch.half).cuda()
a = torch.rand((10, 10), dtype=torch.half).cuda()
f_s(x, y, a)
f_s(x, y, a)
f_s(x, y, a)
```
Test Plan: Imported from OSS
Reviewed By: eellison
Differential Revision: D34975310
Pulled By: davidberard98
fbshipit-source-id: 2379c9a6f371cd58da6a187c1f16882f3923ab24
(cherry picked from commit 96c87992c65f5e6bb1bdd51791682dd837af99b4)
