[Partition] Remove redudant model splitting, Improve Input Model Parsing #1609
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Description
This PR includes 2 changes
Removed a redundant call to save_pretrained_split in TNXModelLoader partition(). Previously it was called in partition() and then called again in load_inf2_model_from_disk(). We retain only the call in load_inf2_model_from_disk().
Improved the error handling of the partition PropertiesManager. Previously, this checked if any .bin files existed in the model artifacts, if not, partitioning would fail. Now, we check for .bin OR .safetensors files, allowing users to pass in models that only have .safetensors files without erros.
cc: @tosterberg