diff --git a/abl/dataset/__init__.py b/abl/dataset/__init__.py
index 267408a..6be0df1 100644
--- a/abl/dataset/__init__.py
+++ b/abl/dataset/__init__.py
@@ -1 +1,3 @@
-from .base_dataset import BaseDataset
\ No newline at end of file
+from .bridge_dataset import BridgeDataset
+from .classification_dataset import ClassificationDataset
+from .regression_dataset import RegressionDataset
\ No newline at end of file
diff --git a/abl/dataset/bridge_dataset.py b/abl/dataset/bridge_dataset.py
new file mode 100644
index 0000000..36bbab7
--- /dev/null
+++ b/abl/dataset/bridge_dataset.py
@@ -0,0 +1,55 @@
+from torch.utils.data import Dataset
+from typing import List, Any, Tuple
+
+
+class BridgeDataset(Dataset):
+    def __init__(self, X: List[Any], Z: List[Any], Y: List[Any]):
+        """Initialize a basic dataset.
+
+        Parameters
+        ----------
+        X : List[Any]
+            A list of objects representing the input data.
+        Z : List[Any]
+            A list of objects representing the symbol.
+        Y : List[Any]
+            A list of objects representing the label.
+        """
+        self.X = X
+        self.Z = Z
+        self.Y = Y
+
+        if self.Z is None:
+            self.Z = [None] * len(self.X)
+
+    def __len__(self):
+        """Return the length of the dataset.
+
+        Returns
+        -------
+        int
+            The length of the dataset.
+        """
+        return len(self.X)
+
+    def __getitem__(self, index: int) -> Tuple[Any, Any]:
+        """Get an item from the dataset.
+
+        Parameters
+        ----------
+        index : int
+            The index of the item to retrieve.
+
+        Returns
+        -------
+        Tuple[Any, Any]
+            A tuple containing the input and output data at the specified index.
+        """
+        if index >= len(self):
+            raise ValueError("index range error")
+
+        X = self.X[index]
+        Z = self.Z[index]
+        Y = self.Y[index]
+
+        return (X, Z, Y)
\ No newline at end of file
diff --git a/abl/dataset/classification_dataset.py b/abl/dataset/classification_dataset.py
new file mode 100644
index 0000000..62c725d
--- /dev/null
+++ b/abl/dataset/classification_dataset.py
@@ -0,0 +1,60 @@
+import torch
+from torch.utils.data import Dataset
+from typing import List, Any, Tuple, Callable
+
+
+class ClassificationDataset(Dataset):
+    def __init__(
+        self, X: List[Any], Y: List[int], transform: Callable[..., Any] = None
+    ):
+        """
+        Initialize the dataset used for classification task.
+
+        Parameters
+        ----------
+        X : List[Any]
+            The input data.
+        Y : List[int]
+            The target data.
+        transform : Callable[..., Any], optional
+            A function/transform that takes in an object and returns a transformed version. Defaults to None.
+        """
+        self.X = X
+        self.Y = torch.LongTensor(Y)
+        self.transform = transform
+
+    def __len__(self) -> int:
+        """
+        Return the length of the dataset.
+
+        Returns
+        -------
+        int
+            The length of the dataset.
+        """
+        return len(self.X)
+
+    def __getitem__(self, index: int) -> Tuple[Any, torch.Tensor]:
+        """
+        Get the item at the given index.
+
+        Parameters
+        ----------
+        index : int
+            The index of the item to get.
+
+        Returns
+        -------
+        Tuple[Any, torch.Tensor]
+            A tuple containing the object and its label.
+        """
+        if index >= len(self):
+            raise ValueError("index range error")
+
+        x = self.X[index]
+        if self.transform is not None:
+            x = self.transform(x)
+
+        y = self.Y[index]
+
+        return x, y
diff --git a/abl/dataset/regression_dataset.py b/abl/dataset/regression_dataset.py
new file mode 100644
index 0000000..a0fc769
--- /dev/null
+++ b/abl/dataset/regression_dataset.py
@@ -0,0 +1,49 @@
+import torch
+from torch.utils.data import Dataset
+from typing import List, Any, Tuple
+
+
+class RegressionDataset(Dataset):
+    def __init__(self, X: List[Any], Y: List[Any]):
+        """Initialize a basic dataset.
+
+        Parameters
+        ----------
+        X : List[Any]
+            A list of objects representing the input data.
+        Y : List[Any]
+            A list of objects representing the output data.
+        """
+        self.X = X
+        self.Y = Y
+
+    def __len__(self):
+        """Return the length of the dataset.
+
+        Returns
+        -------
+        int
+            The length of the dataset.
+        """
+        return len(self.X)
+
+    def __getitem__(self, index: int) -> Tuple[Any, Any]:
+        """Get an item from the dataset.
+
+        Parameters
+        ----------
+        index : int
+            The index of the item to retrieve.
+
+        Returns
+        -------
+        Tuple[Any, Any]
+            A tuple containing the input and output data at the specified index.
+        """
+        if index >= len(self):
+            raise ValueError("index range error")
+
+        x = self.X[index]
+        y = self.Y[index]
+
+        return x, y