Added extensions and an example extension that merges models

extensions/example/__init__.py

@@ -0,0 +1,25 @@
+# This is an example extension for custom training. It is great for experimenting with new ideas.
+from toolkit.extension import Extension
+
+
+# We make a subclass of Extension
+class ExampleMergeExtension(Extension):
+    # uid must be unique, it is how the extension is identified
+    uid = "example_merge_extension"
+
+    # name is the name of the extension for printing
+    name = "Example Merge Extension"
+
+    # This is where your process class is loaded
+    # keep your imports in here so they don't slow down the rest of the program
+    @classmethod
+    def get_process(cls):
+        # import your process class here so it is only loaded when needed and return it
+        from .ExampleMergeModels import ExampleMergeModels
+        return ExampleMergeModels
+
+
+AI_TOOLKIT_EXTENSIONS = [
+    # you can put a list of extensions here
+    ExampleMergeExtension
+]