doc: add warning to reduction detection

discopop_explorer/pattern_detectors/reduction_detector.py

@@ -9,6 +9,7 @@
 
 from multiprocessing import Pool
 from typing import List, cast, Set, Tuple
+import warnings
 
 from alive_progress import alive_bar  # type: ignore
 
@@ -80,6 +81,8 @@ def run_detection(pet: PEGraphX, hotspots) -> List[ReductionInfo]:
 
     nodes = cast(List[LoopNode], filter_for_hotspots(pet, cast(List[Node], nodes), hotspots))
 
+    warnings.warn("REDUCTION DETECTION CURRENTLY ASSUMES THE EXISTENCE OF DEPENDENCY METADATA!")
+
     param_list = [(node) for node in nodes]
     with Pool(initializer=__initialize_worker, initargs=(pet,)) as pool:
         tmp_result = list(tqdm.tqdm(pool.imap_unordered(__check_node, param_list), total=len(param_list)))