add documentation to pytorch data convertor

freqtrade/freqai/torch/PyTorchDataConvertor.py

@@ -31,6 +31,12 @@ class DefaultPyTorchDataConvertor(PyTorchDataConvertor):
             target_tensor_type: Optional[torch.dtype] = None,
             squeeze_target_tensor: bool = False
     ):
+        """
+        :param target_tensor_type: type of target tensor, for classification use
+            torch.long, for regressor use torch.float or torch.double.
+        :param squeeze_target_tensor: controls the target shape, used for loss functions
+            that requires 0D or 1D.
+        """
         self._target_tensor_type = target_tensor_type
         self._squeeze_target_tensor = squeeze_target_tensor