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Add support for torch.set_default_device when initializing model parameters #1158

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@fshp971 fshp971 commented Dec 28, 2023

What does this PR do?

Replace torch.Tensor with torch.empty when initializing model parameters.

The reason is that torch.empty is compatible with torch.set_default_device (but torch.Tensor is not), thus enable one to efficiently initialize a large ML model with specified GPUs.

(An example is that initialize a Llama2 model with the default torch.nn.init.xavier_normal_ method is extremely slow on CPUs, but very fast on GPUs.)

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…llel/layers.py` to support `torch.set_default_device`
@facebook-github-bot facebook-github-bot added the CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. label Dec 28, 2023
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