[MOT] remove cython_bbox (#3064)

* remove cython_bbox, test=document_fix

* add cython_bbox install log, test=document_fix

Author: nemonameless

ppdet/modeling/mot/matching/jde_matching.py

@@ -21,6 +21,9 @@
 from scipy.spatial.distance import cdist
 from ..motion import kalman_filter
 
+from ppdet.utils.logger import setup_logger
+logger = setup_logger(__name__)
+
 __all__ = [
     'merge_matches',
     'linear_assignment',
@@ -70,7 +73,13 @@ def cython_bbox_ious(atlbrs, btlbrs):
     ious = np.zeros((len(atlbrs), len(btlbrs)), dtype=np.float)
     if ious.size == 0:
         return ious
-    import cython_bbox
+    try:
+        import cython_bbox
+    except Exception as e:
+        logger.error('cython_bbox not found, please install cython_bbox.'
+                     'for example: `pip install cython_bbox`.')
+        raise e
+
     ious = cython_bbox.bbox_overlaps(
         np.ascontiguousarray(
             atlbrs, dtype=np.float),

requirements.txt

@@ -12,6 +12,5 @@ pycocotools
 setuptools>=42.0.0
 lap
 sklearn
-cython_bbox
 motmetrics
-openpyxl
+openpyxl