refactor(Naming): use new convention, added Ensemble model parameter back, support multiple Meta-Labeling models (#132)

* refactor(Naming): use `primary_models` & `meta_labeling_models`

* refactor(Naming): using primary * meta_labeling across config and in pipeline

* feat(Pipeline): added back Ensemble models

* fix(Pipeline): compiler error

* fix(Config): typo

* chore(Pipeline): removed unused averaging step

* revert the changes in discretizing

* chore(Pipeline): remove sharpe improvement logging

* fix(Pipeline): ensemble predictions should be a pd.Series instead of a DataFrame

* fix(Pipeline): discard unnecessary ensemble_probabilities

* fix(Pipeline): fixes regarding various meta-labeling ensemble bugs

* fix(Reporting): use the new naming convention

* fix(Reporting): use the right variable

* feat(Sweep): new sweep for ensemble models

* fix(Sweep): config reference

* fix(Config): simplified dev config

* fix(Models): use the faster LR model

* fix(Models): use LGBM in the meta-labeling model for speed

* fix(Selection): always use the first model for feature selection, commented out caching from select_features() as it's close to redundant in terms of speed

training/meta_labeling.py

@@ -1,20 +1,23 @@
 from utils.evaluate import discretize_threeway_threshold, evaluate_predictions
 from utils.helpers import random_string, equal_except_nan, drop_until_first_valid_index
-from training.training import run_single_asset_trainig
+from training.primary_model import train_primary_model
 from feature_selection.feature_selection import select_features
 import pandas as pd
 from models.model_map import default_feature_selector_regression, default_feature_selector_classification
+from models.base import Model
 
 
-def run_meta_labeling_training(
+def train_meta_labeling_model(
                             target_asset: str,
                             X_pca: pd.DataFrame,
                             input_predictions: pd.Series,
                             y: pd.Series,
                             target_returns: pd.Series,
+                            models: list[tuple[str, Model]],
                             data_config: dict,
                             model_config: dict,
-                            training_config: dict
+                            training_config: dict,
+                            model_suffix: str
                         ) -> tuple[pd.Series, pd.Series, pd.DataFrame, dict]:
 
     discretize = discretize_threeway_threshold(0.33)
@@ -24,29 +27,34 @@ def run_meta_labeling_training(
     print("Feature Selection started")
     backup_model = default_feature_selector_regression if data_config['method'] == 'regression' else default_feature_selector_classification
     meta_feature_selection_input_X, meta_feature_selection_input_y = drop_until_first_valid_index(X_pca, meta_y)
-    feature_selection_output = select_features(X = meta_feature_selection_input_X, y = meta_feature_selection_input_y, model = model_config['level_1_models'][0][1], n_features_to_select = training_config['n_features_to_select'], backup_model = backup_model, scaling = training_config['scaler'], dynamic_feature_selection = training_config['dynamic_feature_selection'], data_config_hash = random_string(10))
+    feature_selection_output = select_features(X = meta_feature_selection_input_X, y = meta_feature_selection_input_y, model = models[0][1], n_features_to_select = training_config['n_features_to_select'], backup_model = backup_model, scaling = training_config['scaler'])
     meta_selected_features_X = X_pca[feature_selection_output.columns]
 
     meta_X = pd.concat([meta_selected_features_X, input_predictions, discretized_predictions], axis = 1)
 
-    _, meta_preds, meta_probabilities, all_models_single_asset = run_single_asset_trainig(
+    _, meta_preds, meta_probabilities, all_models_single_asset = train_primary_model(
         ticker_to_predict = "prediction_correct",
         original_X = meta_X,
         X = meta_X,
         y = meta_y,
         target_returns = target_returns,
-        models = [model_config['level_2_model']],
-        method = data_config['method'],
-        expanding_window = training_config['expanding_window_level2'],
-        sliding_window_size = training_config['sliding_window_size_level2'],
+        models = models,
+        method = 'classification',
+        expanding_window = training_config['expanding_window_meta_labeling'],
+        sliding_window_size = training_config['sliding_window_size_meta_labeling'],
         retrain_every = training_config['retrain_every'],
         scaler = training_config['scaler'],
         no_of_classes = 'two',
-        level = 2
+        level = 'meta_labeling',
+        print_results = False
     )
-    bet_size = meta_probabilities.iloc[:,1]
+    if len(models) > 1:
+        meta_preds = meta_preds.mean(axis = 1)
+        bet_size = meta_probabilities[meta_probabilities.columns[1::2]].mean(axis = 1)
+    else:
+        bet_size = meta_probabilities.iloc[:,1]
     avg_predictions_with_sizing = input_predictions * bet_size
-    avg_predictions_with_sizing.rename("model_" + target_asset + "_meta_lvl" + str(2), inplace=True)
+    avg_predictions_with_sizing.rename("model_" + target_asset + "_" + model_suffix, inplace=True)
 
     meta_result = evaluate_predictions(
         model_name = "Meta",
@@ -54,9 +62,10 @@ def run_meta_labeling_training(
         y_pred = avg_predictions_with_sizing,
         y_true = y,
         method = 'classification',
-        no_of_classes = data_config['no_of_classes'],
+        no_of_classes = 'two',
+        print_results = True,
         discretize=False
     )
-    meta_result.rename("model_" + target_asset + "_meta_lvl" + str(2), inplace=True)
+    meta_result.rename("model_" + target_asset + "_" + model_suffix, inplace=True)
 
     return meta_result, avg_predictions_with_sizing, meta_probabilities, all_models_single_asset