Adjust rolling api (#1594)

* Intermediate version

* Fix yaml template & Successfully run rolling

* Be compatible with benchmark

* Get same results with previous linear model

* Black formatting

* Update black

* Update the placeholder mechanism

* Update CI

* Update CI

* Upgrade Black

* Fix CI and simplify code

* Fix CI

* Move the data processing caching mechanism into utils.

* Adjusting DDG-DA

* Organize import

qlib/data/cache.py

@@ -583,7 +583,6 @@ class DiskExpressionCache(ExpressionCache):
         r.tofile(str(cache_path))
 
     def update(self, sid, cache_uri, freq: str = "day"):
-
         cp_cache_uri = self.get_cache_dir(freq).joinpath(sid).joinpath(cache_uri)
         meta_path = cp_cache_uri.with_suffix(".meta")
         if not self.check_cache_exists(cp_cache_uri, suffix_list=[".meta"]):
@@ -696,7 +695,6 @@ class DiskDatasetCache(DatasetCache):
     def _dataset(
         self, instruments, fields, start_time=None, end_time=None, freq="day", disk_cache=0, inst_processors=[]
     ):
-
         if disk_cache == 0:
             # In this case, data_set cache is configured but will not be used.
             return self.provider.dataset(
@@ -801,7 +799,6 @@ class DiskDatasetCache(DatasetCache):
         KEY = "df"
 
         def __init__(self, cache_path: Union[str, Path]):
-
             self.index_path = cache_path.with_suffix(".index")
             self._data = None
             self.logger = get_module_logger(self.__class__.__name__)
@@ -1126,7 +1123,6 @@ class DatasetURICache(DatasetCache):
     def dataset(
         self, instruments, fields, start_time=None, end_time=None, freq="day", disk_cache=0, inst_processors=[]
     ):
-
         if "local" in C.dataset_provider.lower():
             # use LocalDatasetProvider
             return self.provider.dataset(
@@ -1189,7 +1185,6 @@ class MemoryCalendarCache(CalendarCache):
         uri = self._uri(start_time, end_time, freq, future)
         result, expire = MemCacheExpire.get_cache(H["c"], uri)
         if result is None or expire:
-
             result = self.provider.calendar(start_time, end_time, freq, future)
             MemCacheExpire.set_cache(H["c"], uri, result)