[MNT] add and modify docstring in bridge folder

abl/bridge/base_bridge.py

@@ -7,6 +7,27 @@ from ..structures import ListData
 
 
 class BaseBridge(metaclass=ABCMeta):
+    """
+    A base class for bridging machine learning and reasoning parts.
+
+    This class provides necessary methods that need to be overridden in subclasses
+    to construct a typical pipeline of Abductive learning (corresponding to ``train``),
+    which involves the following four methods:
+
+        - predict: Predict class indices on the given data samples.
+        - idx_to_pseudo_label: Map indices into pseudo labels.
+        - abduce_pseudo_label: Revise pseudo labels based on abdutive reasoning.
+        - pseudo_label_to_idx: Map revised pseudo labels back into indices.
+
+    Parameters
+    ----------
+    model : ABLModel
+        The machine learning model wrapped in ``ABLModel``, which is mainly used for
+        prediction and model training.
+    reasoner : Reasoner
+        The reasoning part wrapped in ``Reasoner``, which is used for pseudo label revision.
+    """
+
     def __init__(self, model: ABLModel, reasoner: Reasoner) -> None:
         if not isinstance(model, ABLModel):
             raise TypeError(
@@ -22,24 +43,25 @@ class BaseBridge(metaclass=ABCMeta):
 
     @abstractmethod
     def predict(self, data_samples: ListData) -> Tuple[List[List[Any]], List[List[Any]]]:
-        """Placeholder for predicting labels from input."""
+        """Placeholder for predicting class indices from input."""
 
     @abstractmethod
     def abduce_pseudo_label(self, data_samples: ListData) -> List[List[Any]]:
-        """Placeholder for abducing pseudo labels."""
+        """Placeholder for revising pseudo labels based on abdutive reasoning."""
 
     @abstractmethod
     def idx_to_pseudo_label(self, data_samples: ListData) -> List[List[Any]]:
-        """Placeholder for mapping indexes to pseudo labels."""
+        """Placeholder for mapping indices to pseudo labels."""
 
     @abstractmethod
     def pseudo_label_to_idx(self, data_samples: ListData) -> List[List[Any]]:
-        """Placeholder for mapping pseudo labels to indexes."""
+        """Placeholder for mapping pseudo labels to indices."""
 
     def filter_pseudo_label(self, data_samples: ListData) -> List[List[Any]]:
-        '''Default filter function for pseudo label.'''
+        """Default filter function for pseudo label."""
         non_empty_idx = [
-            i for i in range(len(data_samples.abduced_pseudo_label))
+            i
+            for i in range(len(data_samples.abduced_pseudo_label))
             if data_samples.abduced_pseudo_label[i]
         ]
         data_samples.update(data_samples[non_empty_idx])

abl/bridge/simple_bridge.py

@@ -12,6 +12,29 @@ from .base_bridge import BaseBridge
 
 
 class SimpleBridge(BaseBridge):
+    """
+    A basic implementation for bridging machine learning and reasoning parts.
+
+    This class implements the typical pipeline of Abductive learning, which involves
+    the following five steps:
+
+        - Predict class probabilities and indices for the given data samples.
+        - Map indices into pseudo labels.
+        - Revise pseudo labels based on abdutive reasoning.
+        - Map the revised pseudo labels to indices.
+        - Train the model.
+
+    Parameters
+    ----------
+    model : ABLModel
+        The machine learning model wrapped in ``ABLModel``, which is mainly used for
+        prediction and model training.
+    reasoner : Reasoner
+        The reasoning part wrapped in ``Reasoner``, which is used for pseudo label revision.
+    metric_list : List[BaseMetric]
+        A list of metrics used for evaluating the model's performance.
+    """
+
     def __init__(
         self,
         model: ABLModel,
@@ -22,14 +45,54 @@ class SimpleBridge(BaseBridge):
         self.metric_list = metric_list
 
     def predict(self, data_samples: ListData) -> Tuple[List[ndarray], List[ndarray]]:
+        """
+        Predict class indices and probabilities (if ``predict_proba`` is implemented in
+        ``self.model.base_model``) on the given data samples.
+
+        Parameters
+        ----------
+        data_samples : ListData
+            Data samples on which predictions are to be made.
+
+        Returns
+        -------
+        Tuple[List[ndarray], List[ndarray]]
+            A tuple containing lists of predicted indices and probabilities.
+        """
         self.model.predict(data_samples)
         return data_samples.pred_idx, data_samples.pred_prob
 
     def abduce_pseudo_label(self, data_samples: ListData) -> List[List[Any]]:
+        """
+        Revise predicted pseudo labels of the given data samples using abduction.
+
+        Parameters
+        ----------
+        data_samples : ListData
+            Data samples containing predicted pseudo labels.
+
+        Returns
+        -------
+        List[List[Any]]
+            A list of abduced pseudo labels for the given data samples.
+        """
         self.reasoner.batch_abduce(data_samples)
         return data_samples.abduced_pseudo_label
 
     def idx_to_pseudo_label(self, data_samples: ListData) -> List[List[Any]]:
+        """
+        Map indices of data samples into pseudo labels.
+
+        Parameters
+        ----------
+        data_samples : ListData
+            Data samples containing the indices.
+
+        Returns
+        -------
+        List[List[Any]]
+            A list of pseudo labels converted from indices.
+        """
         pred_idx = data_samples.pred_idx
         data_samples.pred_pseudo_label = [
             [self.reasoner.mapping[_idx] for _idx in sub_list] for sub_list in pred_idx
@@ -37,6 +100,19 @@ class SimpleBridge(BaseBridge):
         return data_samples.pred_pseudo_label
 
     def pseudo_label_to_idx(self, data_samples: ListData) -> List[List[Any]]:
+        """
+        Map pseudo labels of data samples into indices.
+
+        Parameters
+        ----------
+        data_samples : ListData
+            Data samples containing pseudo labels.
+
+        Returns
+        -------
+        List[List[Any]]
+            A list of indices converted from pseudo labels.
+        """
         abduced_idx = [
             [self.reasoner.remapping[_abduced_pseudo_label] for _abduced_pseudo_label in sub_list]
             for sub_list in data_samples.abduced_pseudo_label
@@ -49,6 +125,21 @@ class SimpleBridge(BaseBridge):
         prefix: str,
         data: Union[ListData, Tuple[List[List[Any]], Optional[List[List[Any]]], List[Any]]],
     ) -> ListData:
+        """
+        Transform data in the form of (X, gt_pseudo_label, Y) into ListData.
+
+        Parameters
+        ----------
+        prefix : str
+            A prefix indicating the type of data processing (e.g., 'train', 'test').
+        data : Union[ListData, Tuple[List[List[Any]], Optional[List[List[Any]]], List[Any]]]
+            Data to be preprocessed. Can be ListData or a tuple of lists.
+
+        Returns
+        -------
+        ListData
+            The preprocessed ListData object.
+        """
         if isinstance(data, ListData):
             data_samples = data
             if not (
@@ -69,6 +160,21 @@ class SimpleBridge(BaseBridge):
     def concat_data_samples(
         self, unlabel_data_samples: ListData, label_data_samples: Optional[ListData]
     ) -> ListData:
+        """
+        Concatenate unlabeled and labeled data samples. ``abduced_pseudo_label`` of unlabeled data samples and ``gt_pseudo_label`` of labeled data samples will be used to train the model.
+
+        Parameters
+        ----------
+        unlabel_data_samples : ListData
+            Unlabeled data samples to concatenate.
+        label_data_samples : Optional[ListData]
+            Labeled data samples to concatenate, if available.
+
+        Returns
+        -------
+        ListData
+            Concatenated data samples.
+        """
         if label_data_samples is None:
             return unlabel_data_samples
 
@@ -89,11 +195,38 @@ class SimpleBridge(BaseBridge):
             Union[ListData, Tuple[List[List[Any]], Optional[List[List[Any]]], List[Any]]]
         ] = None,
         loops: int = 50,
-        segment_size: Union[int, float] = -1,
+        segment_size: Union[int, float] = 1.0,
         eval_interval: int = 1,
         save_interval: Optional[int] = None,
         save_dir: Optional[str] = None,
     ):
+        """
+        A typical training pipeline of Abuductive Learning.
+
+        Parameters
+        ----------
+        train_data : Union[ListData, Tuple[List[List[Any]], Optional[List[List[Any]]], List[Any]]]
+            Training data.
+        label_data : Optional[Union[ListData, Tuple[List[List[Any]], Optional[List[List[Any]]], List[Any]]]]
+            Data with ``gt_pseudo_label`` that can be used to train the model, by
+            default None.
+        val_data : Optional[Union[ListData, Tuple[List[List[Any]], Optional[List[List[Any]]], List[Any]]]]
+            Validation data, by default None.
+        loops : int
+            Machine Learning part and Reasoning part will be iteratively optimized
+            for ``loops`` times, by default 50.
+        segment_size : Union[int, float]
+            Data will be split into segments of this size and data in each segment
+            will be used together to train the model, by default 1.0.
+        eval_interval : int
+            The model will be evaluated every ``eval_interval`` loops during training,
+            by default 1.
+        save_interval : Optional[int]
+            The model will be saved every ``eval_interval`` loops during training, by
+            default None.
+        save_dir : Optional[str]
+            Directory to save the model, by default None.
+        """
         data_samples = self.data_preprocess("train", train_data)
 
         if label_data is not None:
@@ -147,6 +280,14 @@ class SimpleBridge(BaseBridge):
                 )
 
     def _valid(self, data_samples: ListData) -> None:
+        """
+        Internal method for validating the model with given data samples.
+
+        Parameters
+        ----------
+        data_samples : ListData
+            Data samples to be used for validation.
+        """
         self.predict(data_samples)
         self.idx_to_pseudo_label(data_samples)
 
@@ -165,6 +306,14 @@ class SimpleBridge(BaseBridge):
         self,
         val_data: Union[ListData, Tuple[List[List[Any]], Optional[List[List[Any]]], List[Any]]],
     ) -> None:
+        """
+        Validate the model with the given validation data.
+
+        Parameters
+        ----------
+        val_data : Union[ListData, Tuple[List[List[Any]], Optional[List[List[Any]]], List[Any]]]
+            Validation data to be used for model evaluation.
+        """
         val_data_samples = self.data_preprocess(val_data)
         self._valid(val_data_samples)
 
@@ -172,5 +321,13 @@ class SimpleBridge(BaseBridge):
         self,
         test_data: Union[ListData, Tuple[List[List[Any]], Optional[List[List[Any]]], List[Any]]],
     ) -> None:
+        """
+        Test the model with the given test data.
+
+        Parameters
+        ----------
+        test_data : Union[ListData, Tuple[List[List[Any]], Optional[List[List[Any]]], List[Any]]]
+            Test data to be used for model evaluation.
+        """
         test_data_samples = self.data_preprocess("test", test_data)
         self._valid(test_data_samples)