Kunal Chakrabarty

Running python main.py with checkpoint None throws up error as `RuntimeError: CUDA out of memory. Tried to allocate 6.12 MiB (GPU 0; 3.95 GiB total capacity; 2.70 GiB already allocated;...

## 🚀 Feature Request In checkpoint_utils.py, in line [312](https://github.com/facebookresearch/metaseq/blob/8ac03810e6ed890f516bbea1a0ad798ebb97c719/metaseq/checkpoint_utils.py#L312), if checkpoint_path_to_load needs to be a valid string and can't be None. However if the string points to an invalid file,...