Script ready to fit final models

explicability/fit_final_models.py

+# Libraries
+# --------------------------------------------------------------------------------------------------------
+import pandas as pd
+import numpy as np
+import shap
+import ast
+import matplotlib.pyplot as plt
+import pickle
+from xgboost import XGBClassifier
+from sklearn.ensemble import RandomForestClassifier, BaggingClassifier, AdaBoostClassifier
+from sklearn.neural_network import MLPClassifier
+from sklearn.svm import SVC
+from sklearn.linear_model import  LogisticRegression
+from sklearn.tree import DecisionTreeClassifier
+# --------------------------------------------------------------------------------------------------------
+
+# Reading training data
+# --------------------------------------------------------------------------------------------------------
+def read_training_data(attribute_names):
+    # Load ORIGINAL training data
+    X_train_pre = np.load('../gen_train_data/data/output/pre/X_train_pre.npy', allow_pickle=True)
+    y_train_pre = np.load('../gen_train_data/data/output/pre/y_train_pre.npy', allow_pickle=True)
+    X_train_post = np.load('../gen_train_data/data/output/post/X_train_post.npy', allow_pickle=True)
+    y_train_post = np.load('../gen_train_data/data/output/post/y_train_post.npy', allow_pickle=True)
+
+    # Load oversampled training data
+    X_train_over_pre = np.load('../gen_train_data/data/output/pre/X_train_over_pre.npy', allow_pickle=True)
+    y_train_over_pre = np.load('../gen_train_data/data/output/pre/y_train_over_pre.npy', allow_pickle=True)
+    X_train_over_post = np.load('../gen_train_data/data/output/post/X_train_over_post.npy', allow_pickle=True)
+    y_train_over_post = np.load('../gen_train_data/data/output/post/y_train_over_post.npy', allow_pickle=True)
+
+    # Load undersampled training data
+    X_train_under_pre = np.load('../gen_train_data/data/output/pre/X_train_under_pre.npy', allow_pickle=True)
+    y_train_under_pre = np.load('../gen_train_data/data/output/pre/y_train_under_pre.npy', allow_pickle=True)
+    X_train_under_post = np.load('../gen_train_data/data/output/post/X_train_under_post.npy', allow_pickle=True)
+    y_train_under_post = np.load('../gen_train_data/data/output/post/y_train_under_post.npy', allow_pickle=True)
+
+    # Type conversion needed    
+    data_dic = {
+        "X_train_pre": pd.DataFrame(X_train_pre, columns=attribute_names).convert_dtypes(),
+        "y_train_pre": y_train_pre,
+        "X_train_post": pd.DataFrame(X_train_post, columns=attribute_names).convert_dtypes(),
+        "y_train_post": y_train_post,
+        "X_train_over_pre": pd.DataFrame(X_train_over_pre, columns=attribute_names).convert_dtypes(),
+        "y_train_over_pre": y_train_over_pre,
+        "X_train_over_post": pd.DataFrame(X_train_over_post, columns=attribute_names).convert_dtypes(),
+        "y_train_over_post": y_train_over_post,
+        "X_train_under_pre": pd.DataFrame(X_train_under_pre, columns=attribute_names).convert_dtypes(),
+        "y_train_under_pre": y_train_under_pre,
+        "X_train_under_post": pd.DataFrame(X_train_under_post, columns=attribute_names).convert_dtypes(),
+        "y_train_under_post": y_train_under_post,
+    }
+    return data_dic
+# --------------------------------------------------------------------------------------------------------
+
+# Initializing chosen models from hyperparameters file
+# --------------------------------------------------------------------------------------------------------
+def get_chosen_model(group_str, method_str, model_name):
+    # Read sheet corresponding to group and method with tuned models and their hyperparameters
+    tuned_models_df = pd.read_excel("../model_selection/output_hyperparam/hyperparamers.xlsx", sheet_name=f"{group_str}_{method_str}")
+    tuned_models_df.columns = ['Model', 'Best Parameters']
+    
+    # Define the mapping from model abbreviations to sklearn model classes
+    model_mapping = {
+        'DT': DecisionTreeClassifier,
+        'RF': RandomForestClassifier,
+        'Bagging': BaggingClassifier,
+        'AB': AdaBoostClassifier,
+        'XGB': XGBClassifier,
+        'LR': LogisticRegression,
+        'SVM': SVC,
+        'MLP': MLPClassifier
+    }
+    
+    # Access the row for the given model name by checking the first column (index 0)
+    row = tuned_models_df[tuned_models_df['Model'] == model_name].iloc[0]
+
+    # Parse the dictionary of parameters from the 'Best Parameters' column
+    parameters = ast.literal_eval(row['Best Parameters'])
+    
+    # Modify parameters based on model specifics or methods if necessary
+    if model_name == 'AB':
+        parameters['algorithm'] = 'SAMME'
+    elif model_name == 'LR':
+        parameters['max_iter'] = 1000
+    elif model_name == 'SVM':
+        parameters['max_iter'] = 1000
+        parameters['probability'] = True
+    elif model_name == "MLP":
+        parameters['max_iter'] = 500
+    
+    # Add class_weight argument for cost-sensitive learning method
+    if 'CW' in method_str:
+        if model_name in ['Bagging', 'AB']:
+            parameters['estimator'] = DecisionTreeClassifier(class_weight='balanced')
+        else:
+            parameters['class_weight'] = 'balanced'
+
+    # Fetch the class of the model
+    model_class = model_mapping[model_name]
+
+    # Initialize the model with the parameters
+    chosen_model = model_class(**parameters)
+    # Return if it is a tree model, for SHAP
+    is_tree = model_name not in ['LR', 'SVM', 'MLP']
+    
+    return chosen_model, is_tree
+# --------------------------------------------------------------------------------------------------------
+
+if __name__ == "__main__":
+    # Setup
+    # --------------------------------------------------------------------------------------------------------
+    # Retrieve attribute names in order
+    attribute_names = list(np.load('../gen_train_data/data/output/attributes.npy', allow_pickle=True))
+    # Reading data
+    data_dic = read_training_data(attribute_names)
+    method_names = {
+        0: "ORIG",
+        1: "ORIG_CW",
+        2: "OVER",
+        3: "UNDER"
+    }
+    model_choices = {
+        "ORIG": "XGB",
+        "ORIG_CW": "RF",
+        "OVER": "XGB",
+        "UNDER": "XGB"
+    }
+    # --------------------------------------------------------------------------------------------------------
+
+    # Fitting final models with whole training dataset
+    # --------------------------------------------------------------------------------------------------------
+    for i, group in enumerate(['pre', 'post']):
+        for j, method in enumerate(['', '', 'over_', 'under_']):
+            print(f"{group}-{method_names[j]}")
+            # Get train dataset based on group and method
+            X_train = data_dic['X_train_' + method + group]
+            y_train = data_dic['y_train_' + method + group]
+            method_name = method_names[j]
+            # Get chosen tuned model for this group and method context
+            model, is_tree = get_chosen_model(group_str=group, method_str=method_name, model_name=model_choices[method_name])
+            fitted_model = model.fit(X_train, y_train)
+            # Define the file path where you want to save the model
+            model_save_path = f"./output/fitted_models/{group}_{method_names[j]}_{model_choices[method_name]}.pkl"
+            # Save the model to disk
+            with open(model_save_path, 'wb') as f:
+                pickle.dump(model, f)
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