torchao-nightly -> --pre torchao in README

[msaroufim]

And we deleted torchao-nightly from pypi @joecummings

Test

(ao) [[email protected] ~/ao (mobiusml/main)]$ pip install --pre torchao  --index-url https://download.pytorch.org/whl/nightly/c
u121 --force-reinstall
Looking in indexes: https://download.pytorch.org/whl/nightly/cu121
Collecting torchao
  Downloading https://download.pytorch.org/whl/nightly/cu121/torchao-0.4.0.dev20240821%2Bcu121-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (930 kB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 930.9/930.9 kB 22.2 MB/s eta 0:00:00
Installing collected packages: torchao
  Attempting uninstall: torchao
    Found existing installation: torchao 0.4.0
    Uninstalling torchao-0.4.0:
      Successfully uninstalled torchao-0.4.0
ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.
torchtune 0.0.0 requires torchao==0.3.1, but you have torchao 0.4.0.dev20240821+cu121 which is incompatible.
Successfully installed torchao-0.4.0.dev20240821+cu121
(ao) [[email protected] ~/ao (mobiusml/main)]$ 

[pytorch-bot]

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