1. Fixing a minor error in Datamodel, where the node name map keys are used instead of values. The keys are strings and we need to use values, which are of node type.

2. Cleaning up notebooks, adding comments, removing files that are not useful.

Author: raghukiran1224

codeflare/pipelines/Datamodel.py

@@ -898,7 +898,7 @@ def has_single_estimator(self):
         if len(self.get_output_nodes()) > 1:
             return False
 
-        for node in self.__node_name_map__.keys():
+        for node in self.__node_name_map__.values():
             is_node_estimator = (node.get_node_input_type() == NodeInputType.OR)
             if is_node_estimator:
                 pre_nodes = self.get_pre_nodes(node)