fastNLP 0.3.1

New features:

• 添加一系列callbacks: EarlyStopCallback, LRFinder, LRScheduler, etc.
• 添加padder, 允许自定义pad方法 (EngChar2dPadder 解决二维padding)
• 拓展DataSet初始化接受的类型
• 多进程batch
• 升级中文分词/词性标注/句法分析 APIs
• 添加BERT和预训练模型加载接口

Bugs fixed:

• validation step counts
• remove GPU id when saving
• refactor type system in FieldArray
• ...

Code structure refined:

• reduced dependency on reproduction/
• renaming folders
• optimized Trainer methods

Testing:

• add tests for callbacks
• more tests for processors

Tutorials:

• 添加一份padding教程
• 添加一份测试指南