Trainer / Training Loop

Full-featured training loop with distributed support (DDP, FSDP, DeepSpeed), gradient accumulation, mixed precision, callbacks, and Hub integration.

# Source: https://github.com/huggingface/transformers | License: Apache-2.0 | Copyright 2018- The Hugging Face team. All rights reserved
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# Copyright 2020-present the HuggingFace Inc. team.
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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
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#     http://www.apache.org/licenses/LICENSE-2.0
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# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
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