[Fix] Fix seg mapping (#1681)

* [Doc]: fix markdown version (#1653)

* [CI] Add circle ci (#1647)

* add circle ci

* delete github ci

* fix ci

* fix ut

* fix markdown version

* rm

* fix seg mapping for scannet

* fix requiremetn

* fix all seg dataet

* resolve commnets
Co-authored-by: VVsssssk <88368822+VVsssssk@users.noreply.github.com>

mmdet3d/datasets/transforms/loading.py

@@ -288,20 +288,6 @@ class PointSegClassMapping(BaseTransform):
     others as len(valid_cat_ids).
     """
 
-    def __init__(self, valid_cat_ids, max_cat_id=40):
-        assert max_cat_id >= np.max(valid_cat_ids), \
-            'max_cat_id should be greater than maximum id in valid_cat_ids'
-
-        self.valid_cat_ids = valid_cat_ids
-        self.max_cat_id = int(max_cat_id)
-
-        # build cat_id to class index mapping
-        neg_cls = len(valid_cat_ids)
-        self.cat_id2class = np.ones(
-            self.max_cat_id + 1, dtype=np.int) * neg_cls
-        for cls_idx, cat_id in enumerate(valid_cat_ids):
-            self.cat_id2class[cat_id] = cls_idx
-
     def transform(self, results: dict) -> None:
         """Call function to map original semantic class to valid category ids.