transformers gguf Composer MosaicML llm-foundry StreamingDatasets en dataset:mc4 dataset:c4 dataset:togethercomputer/RedPajama-Data-1T dataset:bigcode/the-stack dataset:allenai/s2orc base_model:mosaicml/mpt-7b base_model:quantized:mosaicml/mpt-7b license:apache-2.0 endpoints_compatible region:us imatrix