adding gpu hdbscan

Author: ddangelov

top2vec/Top2Vec.py

@@ -26,6 +26,13 @@
 except ImportError:
     _HAVE_CUMAP = False
 
+try:
+    from cuml.cluster import HDBSCAN as cuHDBSCAN
+
+    _HAVE_CUHDBSCAN = True
+except ImportError:
+    _HAVE_CUHDBSCAN = False
+
 try:
     import hnswlib
 
@@ -1369,13 +1376,19 @@ def compute_topics(self,
                             'metric': 'euclidean',
                             'cluster_selection_method': 'eom'}
 
-        cluster = hdbscan.HDBSCAN(**hdbscan_args).fit(umap_embedding)
+        if gpu_hdbscan and _HAVE_CUHDBSCAN:
+            cluster = cuHDBSCAN(**hdbscan_args)
+            labels = cluster.fit_predict(umap_embedding)
+
+        else:
+            cluster = hdbscan.HDBSCAN(**hdbscan_args).fit(umap_embedding)
+            labels = cluster.labels_
 
         # calculate topic vectors from dense areas of documents
         logger.info('Finding topics')
 
         # create topic vectors
-        self._create_topic_vectors(cluster.labels_)
+        self._create_topic_vectors(labels)
 
         # deduplicate topics
         self._deduplicate_topics(topic_merge_delta)