fix tra dataset bug (#1050)

examples/benchmarks/TRA/src/dataset.py

@@ -6,8 +6,7 @@
 import numpy as np
 import pandas as pd
 
-from qlib.utils import init_instance_by_config
-from qlib.data.dataset import DatasetH, DataHandler
+from qlib.data.dataset import DatasetH
 
 
 device = "cuda" if torch.cuda.is_available() else "cpu"
@@ -95,7 +94,7 @@ def __init__(
         shuffle=True,
         pin_memory=False,
         drop_last=False,
-        **kwargs
+        **kwargs,
     ):
 
         assert horizon > 0, "please specify `horizon` to avoid data leakage"
@@ -150,8 +149,15 @@ def setup_data(self, handler_kwargs: dict = None, **kwargs):
 
     def _prepare_seg(self, slc, **kwargs):
         fn = _get_date_parse_fn(self._index[0][1])
-        start_date = fn(slc.start)
-        end_date = fn(slc.stop)
+
+        if isinstance(slc, slice):
+            start, stop = slc.start, slc.stop
+        elif isinstance(slc, (list, tuple)):
+            start, stop = slc
+        else:
+            raise NotImplementedError(f"This type of input is not supported")
+        start_date = fn(start)
+        end_date = fn(stop)
         obj = copy.copy(self)  # shallow copy
         # NOTE: Seriable will disable copy `self._data` so we manually assign them here
         obj._data = self._data

qlib/data/dataset/__init__.py

@@ -171,6 +171,7 @@ def _prepare_seg(self, slc, **kwargs):
         Parameters
         ----------
         slc : please refer to the docs of `prepare`
+                NOTE: it may not be an instance of slice. It may be a segment of `segments` from `def prepare`
         """
         if hasattr(self, "fetch_kwargs"):
             return self.handler.fetch(slc, **kwargs, **self.fetch_kwargs)