Remove hard torch dependency at install#1166
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I think we can also update the docs here? https://github.com/microsoft/DeepSpeed/blame/master/docs/_tutorials/advanced-install.md#L14
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In order to support pre-compiling our ops we require torch already be installed. However, when projects want to depend on deepspeed in a requirements file in many cases they are not able to do so (see issue #663). This PR allows changes this requirement to only be enforced if the user explictly tries to pre-compile any of the deepspeed ops.