add documentation

freqtrade/freqai/torch/PyTorchDataConvertor.py

@@ -6,6 +6,10 @@ import torch
 
 
 class PyTorchDataConvertor(ABC):
+    """
+    This class is responsible for converting `*_features` & `*_labels` pandas dataframes
+    to pytorch tensors.
+    """
 
     @abstractmethod
     def convert_x(self, df: pd.DataFrame, device: Optional[str] = None) -> Tuple[torch.Tensor, ...]:
@@ -25,6 +29,9 @@ class PyTorchDataConvertor(ABC):
 
 
 class DefaultPyTorchDataConvertor(PyTorchDataConvertor):
+    """
+    A default conversion that keeps features dataframe shapes.
+    """
 
     def __init__(
             self,