Is it possible to load a HuggingFace Big Model that has been sharded, but then save it as a single file that is not sharded?

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Yes, it is possible to load a HuggingFace Big Model that has been sharded and save it as a single file that is not sharded. You can use the from_pretrained method to load the sharded model and then use the save_pretrained method to save the model as a single file. Here's an example:

from transformers import AutoModel, AutoConfig

# Load the sharded model
config = AutoConfig.from_pretrained('path/to/sharded/model/config.json')
model = AutoModel.from_pretrained('path/to/sharded/model/', config=config)

# Save the model as a single file
model.save_pretrained('path/to/saved/model/')

This will save the model as a single file in the specified path. Note that the from_pretrained method automatically detects if the model is sharded and loads it accordingly.