Fix the retention for existing gradients in the Grad Acc API #8658
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In this PR, we fix an issue in which the existing branch to check for existing gradients in the model parameters is ambiguous without explicitly adding the None comparator.
This branch was originally created to maintain the gradients if there is already preliminary computation. However, we have noticed that the time transferring to the device can also be a bottleneck. This can be mitigated by not zero'ing the gradients to None, but instead retaining them as zeros.