pytorch
0eb45d54 - Bind autograd current Node for debugging purposes (#90867)
Commit
1 year agoBind autograd current Node for debugging purposes (#90867)
This allows to know at any point during the backward pass what is running and where the Node currently running was created at:
```python
import torch
from torch.utils._python_dispatch import TorchDispatchMode
from torch.autograd import detect_anomaly
class MyMode(TorchDispatchMode):
def __torch_dispatch__(self, func, types, args, kwargs=None):
node = torch._C._current_autograd_node()
print(f"Running {func} from within {node}")
if node is not None:
print("The Node was created at:")
print("\n ".join(node.metadata["traceback_"]))
return func(*args, **kwargs or {})
with MyMode(), detect_anomaly():
print("FW")
a = torch.rand(10, requires_grad=True)
b = a.mul(2)
b = b.div(3)
b = b.sum()
print("BW")
b.backward()
```
Gives
```
$ python foo.py
foo.py:15: UserWarning: Anomaly Detection has been enabled. This mode will increase the runtime and should only be enabled for debugging.
with MyMode(), detect_anomaly():
FW
Running aten.rand.default from within None
Running aten.mul.Tensor from within None
Running aten.div.Tensor from within None
Running aten.sum.default from within None
BW
Running aten.ones_like.default from within None
Running aten.expand.default from within <SumBackward0 object at 0x7fa40c0c6dc0>
The Node was created at:
File "foo.py", line 20, in <module>
b = b.sum()
Running aten.isnan.default from within <SumBackward0 object at 0x7fa40c0c6500>
The Node was created at:
File "foo.py", line 20, in <module>
b = b.sum()
Running aten.any.default from within <SumBackward0 object at 0x7fa32b23a780>
The Node was created at:
File "foo.py", line 20, in <module>
b = b.sum()
Running aten._local_scalar_dense.default from within <SumBackward0 object at 0x7fa40c0c9190>
The Node was created at:
File "foo.py", line 20, in <module>
b = b.sum()
Running aten.div.Tensor from within <DivBackward0 object at 0x7fa40c0c9190>
The Node was created at:
File "foo.py", line 19, in <module>
b = b.div(3)
Running aten.isnan.default from within <DivBackward0 object at 0x7fa40c0c9190>
The Node was created at:
File "foo.py", line 19, in <module>
b = b.div(3)
Running aten.any.default from within <DivBackward0 object at 0x7fa40c0c9190>
The Node was created at:
File "foo.py", line 19, in <module>
b = b.div(3)
Running aten._local_scalar_dense.default from within <DivBackward0 object at 0x7fa40c0c9190>
The Node was created at:
File "foo.py", line 19, in <module>
b = b.div(3)
Running aten.mul.Tensor from within <MulBackward0 object at 0x7fa40c0c9190>
The Node was created at:
File "foo.py", line 18, in <module>
b = a.mul(2)
Running aten.isnan.default from within <MulBackward0 object at 0x7fa40c0c9190>
The Node was created at:
File "foo.py", line 18, in <module>
b = a.mul(2)
Running aten.any.default from within <MulBackward0 object at 0x7fa40c0c9190>
The Node was created at:
File "foo.py", line 18, in <module>
b = a.mul(2)
Running aten._local_scalar_dense.default from within <MulBackward0 object at 0x7fa40c0c9190>
The Node was created at:
File "foo.py", line 18, in <module>
b = a.mul(2)
Running aten.detach.default from within <AccumulateGrad object at 0x7fa40c0c9730>
The Node was created at:
File "foo.py", line 18, in <module>
b = a.mul(2)
Running aten.detach.default from within <AccumulateGrad object at 0x7fa40c0c94b0>
The Node was created at:
File "foo.py", line 18, in <module>
b = a.mul(2)
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/90867
Approved by: https://github.com/soulitzer
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