added support for pipelinehlper at root of model

src/dbispipeline/analytics.py

@@ -152,12 +152,18 @@ def _read_parameters(dictionary, prefix='', use_prefix=True):
         return dictionary
     result = {}
     for k, v in dictionary.items():
-        # parameter contains a PipelineHelper, we need recursion
-        if '__selected_model' in k:
+        # PipelineHelper is the root of the model
+        if k == 'selected_model':
+            k = prefix + k if use_prefix else k
+            result[k] = str(v[0])
+            result.update(_read_parameters(v[1], v[0] + '__'))
+        # PipelineHelper is somewhere else
+        elif '__selected_model' in k:
             # the [:-16] cuts off the string '__selected_model'
             key_name = prefix + k[:-16] if use_prefix else k[:-16]
             result[key_name] = str(v[0])
-            result.update(_read_parameters(v[1], f'{v[0]}__'))
+            result.update(_read_parameters(v[1], v[0] + '__'))
+        # "Regular" GridSearch element
         else:
             key_name = prefix + k if use_prefix else k
             result[key_name] = f'{v}'