[DOC, MNT] resolve dataset relative comments

docs/Intro/Datasets.rst

@@ -13,7 +13,7 @@ Dataset & Data Structure
 Dataset
 -------
 
-ABL-Package offers several `dataset classes <../API/abl.dataset.html>`_ for different usage, such as ``ClassificationDataset``, ``RegressionDataset`` and ``PredictionDataset``, while users are only required to organize the dataset into a tuple consists of the following three components
+ABL-Package assumes user data to be structured as a tuple, comprising the following three components:
 
 - ``X``: List[List[Any]]
     A list of instances representing the input data. We refer to each List in ``X`` as an instance and one instance may contain several elements.

docs/Intro/Quick-Start.rst

@@ -68,8 +68,6 @@ Out:
    Shape of X [C, H, W]: torch.Size([1, 28, 28])
 
 
-ABL-Package provides several dataset classes for different purposes, including ``ClassificationDataset``, ``RegressionDataset``, and ``PredictionDataset``. However, it's not necessary to encapsulate data into these specific classes. Instead, we only need to structure our datasets in the aforementioned formats.
-
 Read more about `preparing datasets <Datasets.html>`_.
 
 Building the Learning Part