Add default configuration for Embeddings, closes #393

src/python/txtai/embeddings/base.py

@@ -93,6 +93,10 @@ def index(self, documents, reindex=False):
             reindex: if this is a reindex operation in which case database creation is skipped, defaults to False
         """
 
+        # Set configuration to default configuration, if empty
+        if not self.config:
+            self.configure(self.defaults())
+
         # Create document database, if necessary
         if not reindex:
             self.database = self.createdatabase()
@@ -571,6 +575,16 @@ def configure(self, config):
         # Query model
         self.query = self.loadquery() if self.config else None
 
+    def defaults(self):
+        """
+        Builds a default configuration.
+
+        Returns:
+            default configuration
+        """
+
+        return {"path": "sentence-transformers/all-MiniLM-L6-v2"}
+
     def loadvectors(self):
         """
         Loads a vector model set in config.

test/python/testembeddings.py

@@ -46,6 +46,17 @@ def tearDownClass(cls):
         if cls.embeddings:
             cls.embeddings.close()
 
+    def testDefaults(self):
+        """
+        Test default configuration
+        """
+
+        # Run index with no config which will fall back to default configuration
+        embeddings = Embeddings()
+        embeddings.index([(uid, text, None) for uid, text in enumerate(self.data)])
+
+        self.assertEqual(embeddings.count(), 6)
+
     def testDelete(self):
         """
         Test delete