New Forecaster framework (#217)

Co-authored-by: seanzhangkx8 <106214464+seanzhangkx8@users.noreply.github.com>
Checked through all implementation and documentation, run demo and got expected results!

convokit/convokitConfig.py

@@ -7,6 +7,7 @@
     "# Default Backend Parameters\n"
     "db_host: localhost:27017\n"
     "data_directory: ~/.convokit/saved-corpora\n"
+    "model_directory: ~/.convokit/saved-models\n"
     "default_backend: mem"
 )
 
@@ -51,6 +52,10 @@ def db_host(self):
     def data_directory(self):
         return self.config_contents.get("data_directory", "~/.convokit/saved-corpora")
 
+    @property
+    def model_directory(self):
+        return self.config_contents.get("model_directory", "~/.convokit/saved-models")
+
     @property
     def default_backend(self):
         return self._get_config_from_env_or_file("default_backend", "mem")

convokit/forecaster/CRAFT/__init__.py

@@ -1,2 +1,3 @@
-from .CRAFTUtil import *
-from .CRAFTNN import *
+from .data import *
+from .model import *
+from .runners import *