Refactor(Training): new outcome types, representative pipeline steps, bet-sizing (#187)

* refactor(Training): added InferenceResult & TrainedModel types

* refactor(Pipeline): introduced TrainingOutcome, BetSizingWithMetaOutcome, etc.

* fix(Pipeline): getting it to compile

* refactor(WalkForward): separate preprocessing step

* feat(Pipeline): separate out transformations processing step

* refactor(Pipeline): use the Directional model terminology, put bet_sizing into pipeline instead of hiding it in a step

* refactor(WalkForward): moved functions to separate folder

* fix(WalkForward): use sparse array to store models, process transformations in parallel (lot faster)

* fix(Tests): and evaluation

* fix(Tests): for realz

* fix(Inference): preloading everything now, renamed primary models to directional models

* fix(BetSizing): was running transformations on the wrong data, oops

* fix(BetSizing): concatenated on the wrong axis accidentally

* fix(Reporting): able to use the new Stats type

* fix(BetSizing): renamed int column names

* fix(Portfolio): name the column properly

* fix(Reporting): rename the correct Series, lol

* fix(Inference): walk_forwad_inference() can deal with models not being aligned with the starting index

* fix(WalkForward): accidentally using the wrong index

* fix(WalkForward): use the correct indicies to fetch last model/transformations

* fix(CI): changed the name of the results

config/sweep_meta_labeling.yaml

@@ -6,7 +6,7 @@ metric:
   goal: maximize
   name: sharpe
 parameters:
-    primary_models_meta_labeling:
+    directional_models_meta:
       value: True
     assets:
       value: ['daily_crypto']
@@ -17,7 +17,7 @@ parameters:
     expanding_window_base:
       values: [True, False]
       distribution: categorical
-    expanding_window_meta_labeling:
+    expanding_window_meta:
       values: [True, False]
       distribution: categorical
     n_features_to_select:
@@ -28,7 +28,7 @@ parameters:
     sliding_window_size_base: 
       values: [180, 280, 380]
       distribution: categorical
-    sliding_window_size_meta_labeling: 
+    sliding_window_size_meta: 
       values: [180, 280, 380]
       distribution: categorical
     retrain_every: 
@@ -42,9 +42,9 @@ parameters:
     load_non_target_asset: 
       values: [True, False]
       distribution: categorical
-    primary_models: 
+    directional_models: 
       value: ["LogisticRegression_two_class", "LDA", "KNN", "CART", "NB", "AB", "RFC", "StaticMom"]
-    meta_labeling_models: 
+    meta_models: 
       values: ["LogisticRegression_two_class", "LDA", "KNN", "CART", "NB", "AB", "RFC"]
       distribution: categorical
     own_features: