FEAT: ovis2 #3170
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FEAT: ovis2 #3170
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新增Ovis多模态模型的实现，包括视觉分词器、数据集处理、训练回调等功能模块。主要包含以下内容： 1. 新增视觉分词器（VisualTokenizer）及其配置类，支持多种视觉模型（如CLIP、SigLIP、AIMv2）。 2. 新增多模态数据集处理模块，支持图像和视频数据的预处理及对话格式的处理。 3. 新增训练回调模块，支持监控模型训练状态及调整参数。 4. 新增Ovis模型的配置类及实现，支持多模态输入的处理及生成。 5. 新增工具类，包括常量定义、日志打印、数据预处理等。 这些改动为多模态模型的训练和推理提供了完整的支持。
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fix #3151