[DOC] add readme.md for models part

abl/models/readme.md

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+# `basic_model.py`
+
+可以使用`basic_model.py`中实现的`BasicModel`类将`pytorch`神经网络模型包装成`sklearn`模型的形式.
+
+## BasicModel 类提供的接口
+
+|  方法   | 功能  |
+|  ----  | ----  |
+| fit(X, y) | 训练神经网络 |
+| predict(X) | 预测 X 的类别 |
+| predict_proba(X) | 预测 X 的类别概率 |
+| score(X, y) | 计算模型在测试数据上的准确率 |
+| save() | 保存模型 |
+| load() | 加载模型 |
+
+
+## BasicModel 类的参数
+
+**model : torch.nn.Module** 
++ The PyTorch model to be trained or used for prediction.
+
+**batch_size : int**
++ The batch size used for training.
+
+**num_epochs : int**
++ The number of epochs used for training.
+
+**stop_loss : Optional[float]**
++ The loss value at which to stop training.
+
+**num_workers : int**
++ The number of workers used for loading data.
+
+**criterion : torch.nn.Module**
++ The loss function used for training.
+
+**optimizer : torch.nn.Module**
++ The optimizer used for training.
+
+**transform : Callable[..., Any]**
++ The transformation function used for data augmentation.
+
+**device : torch.device**
++ The device on which the model will be trained or used for prediction.
+
+**recorder : Any**
++ The recorder used to record training progress.
+
+**save_interval : Optional[int]**
++ The interval at which to save the model during training.
+
+**save_dir : Optional[str]**
++ The directory in which to save the model during training.
+
+**collate_fn : Callable[[List[T]], Any]**
++ The function used to collate data.
+
+## 例子
+>
+> ```python
+> # Three necessary component
+> cls = LeNet5()
+> criterion = nn.CrossEntropyLoss()
+> optimizer = torch.optim.Adam(cls.parameters())
+> 
+> # Initialize base_model
+> base_model = BasicModel(
+>     cls,
+>     criterion,
+>     optimizer,
+>     torch.device("cuda:0"),
+>     batch_size=32,
+>     num_epochs=10,
+> )
+>
+> # Prepare data
+> train_X, train_y = get_train_data()
+> test_X, test_y = get_test_data()
+> 
+> # Train model
+> base_model.fit(train_X, train_y)
+>
+> # Predict
+> base_model.predict(test_X)
+>
+> # Validation
+> base_model.score(test_X, test_y)
+> ```
+
+# `wabl_models.py`
+
+`wabl_models.py`中实现的`WABLBasicModel`能够序列化数据并为不同的机器学习模型提供统一的接口.
+
+## WABLBasicModel 类提供的接口
+
+|  方法   | 功能  |
+|  ----  | ----  |
+| train(X, Y) | 利用训练数据训练机器学习模型（不涉及反绎） |
+| predict(X) | 预测 X 的类别和概率 |
+| valid(X, Y) | 计算模型在测试数据上的准确率 |
+
+## WABLBasicModel 类的参数
+**base_model : Machine Learning Model**
++ The base model to use for training and prediction.
+
+**pseudo_label_list : List[Any]**
++ A list of pseudo labels to use for training.
+
+## 序列化数据
+考虑到训练数据可能多种组织形式，比如：\
+`X: List[List[img]], Y: List[List[label]]`\
+`X: List[List[img]], Y: List[label]`\
+`X: List[img], Y: List[label]`
+... \
+不便于训练. 因此先将形式统一为：`X: List[img], Y: List[label]`，也就是所谓的序列化数据.
+
+## 例子
+>
+> ```python
+> # Three necessary component
+> # 'ml_model' is no longer limited to NN models
+> model = WABLBasicModel(ml_model, kb.pseudo_label_list)
+>
+> # Prepare data
+> train_X, train_y = get_train_data()
+> test_X, test_y = get_test_data()
+> 
+> # Train model
+> model.train(train_X, train_y)
+>
+> # Predict
+> model.predict(test_X)
+>
+> # Validation
+> model.valid(test_X, test_y)
+> ```