Allow no quantization during QATConfig convert #2694
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🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/2694
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**Summary:** This commit adds back the functionality to swap
`FakeQuantized*` modules back to the corresponding `torch.nn.*`
without performing post-training quantization:
```
QATConfig(base_config=None, step="convert")
```
This has the exact same functionality as this deprecated config:
```
FromIntXQuantizationAwareTrainingConfig()
```
This functionality is added back since it may be useful to users
who wish to save QAT trained checkpoints from models containing
only `torch.nn.*` modules (not `FakeQuanitzed*` modules), e.g.
when training and inference need to happen on different machines:
```
quantize_(model, QATConfig(base_ptq_config, step="prepare"))
train(model)
quantize_(model, QATConfig(step="convert"))
torch.save(model.state_dict(), "my_checkpoint.pt")
\# On a different machine
model.load_state_dict(torch.load("my_checkpoint.pt"))
quantize_(model, base_ptq_config)
```
**Test Plan:**
```
python test/quantization/test_qat.py -k qat_config_init
python test/quantization/test_qat.py -k qat_api_convert_no_quantization
```
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Summary: This commit adds back the functionality to swap
FakeQuantized*modules back to the correspondingtorch.nn.*without performing post-training quantization:This has the exact same functionality as this deprecated config:
This functionality is added back since it may be useful to users who wish to save QAT trained checkpoints from models containing only
torch.nn.*modules (notFakeQuanitzed*modules), e.g. when training and inference need to happen on different machines:Test Plan: