fix dimensionality error when switching from one model to the other and using the same document

document_qa/document_qa_engine.py

@@ -259,8 +259,9 @@ class DocumentQAEngine:
                                                            metadatas=metadata,
                                                            collection_name=hash)
         else:
-            if 'documents' in self.embeddings_dict[hash].get() and len(self.embeddings_dict[hash].get()['documents']) == 0:
-                self.embeddings_dict[hash].delete(ids=self.embeddings_dict[hash].get()['ids'])
+            # if 'documents' in self.embeddings_dict[hash].get() and len(self.embeddings_dict[hash].get()['documents']) == 0:
+            #     self.embeddings_dict[hash].delete(ids=self.embeddings_dict[hash].get()['ids'])
+            self.embeddings_dict[hash].delete_collection()
             self.embeddings_dict[hash] = Chroma.from_texts(texts,
                                                            embedding=self.embedding_function,
                                                            metadatas=metadata,