from sklearn.metrics import roc_auc_score, average_precision_score, confusion_matrix, f1_score, precision_score, \ recall_score, accuracy_score from matplotlib import pyplot as plt from sklearn import metrics import numpy as np import pandas as pd from statsmodels.stats.weightstats import ttest_ind class Evaluation: @staticmethod def plot_train_val_accuracy(train_accuracies, val_accuracies, num_epochs): """ Plot training and validation accuracies over epochs. Parameters: - train_accuracies (list): List of training accuracies. - val_accuracies (list): List of validation accuracies. - num_epochs (int): Number of training epochs. Returns: - None """ plt.xlabel('Epoch') plt.ylabel('Accuracy') plt.title('Training and Validation Accuracies') plt.plot(range(1, num_epochs + 1), train_accuracies, label='Train Accuracy') plt.plot(range(1, num_epochs + 1), val_accuracies, label='Validation Accuracy') plt.legend() plt.show() @staticmethod def plot_train_val_loss(train_loss, val_loss, num_epochs): """ Plot training and validation losses over epochs. Parameters: - train_loss (list): List of training losses. - val_loss (list): List of validation losses. - num_epochs (int): Number of training epochs. Returns: - None """ plt.xlabel('Epoch') plt.ylabel('Loss') plt.title('Training and Validation Losses') plt.plot(range(1, num_epochs + 1), train_loss, label='Train Loss') plt.plot(range(1, num_epochs + 1), val_loss, label='Validation Loss') plt.legend() plt.show() @staticmethod def evaluate(all_targets, mlp_output, show_plot=True): """ Evaluate model performance based on predictions and targets. Parameters: - all_targets (numpy.ndarray): True target labels. - mlp_output (numpy.ndarray): Predicted probabilities. - show_plot (bool): Whether to display ROC and PR curves. Returns: - results (dict): Dictionary containing evaluation metrics. """ # Step 1: Convert predicted probabilities to binary labels predicted_labels = np.where(mlp_output > 0.5, 1, 0) predicted_labels = predicted_labels.reshape(-1) all_predictions = predicted_labels # Step 2: Calculate and print AUC fpr, tpr, thresholds = metrics.roc_curve(all_targets, mlp_output) auc = np.round(metrics.auc(fpr, tpr), 2) # Step 3: Calculate and print AUPRC precision, recall, thresholds = metrics.precision_recall_curve(all_targets, mlp_output) auprc = np.round(metrics.auc(recall, precision), 2) # Step 4: Print accuracy, AUC, AUPRC, and confusion matrix accuracy = accuracy_score(all_targets, all_predictions) cm = confusion_matrix(all_targets, all_predictions) precision = cm[0, 0] / (cm[0, 0] + cm[0, 1]) recall = cm[0, 0] / (cm[0, 0] + cm[1, 0]) f1_score = 2 * precision * recall / (precision + recall) print(f'Accuracy: {accuracy:.2f}') print(f'AUC: {auc:.2f}') print(f'AUPRC: {auprc:.2f}') print(f'Confusion matrix:\n{cm}') print(f'Precision: {precision:.3f}, Recall: {recall:.3f}, F1 score: {f1_score:.3f}') # Step 5: Display ROC and PR curves if requested if show_plot: plt.xlabel('False Positive Rate') plt.ylabel('True Positive Rate') plt.title(f'ROC Curve: AUC={auc}') plt.plot(fpr, tpr) plt.show() plt.xlabel('Recall') plt.ylabel('Precision') plt.title(f'PR Curve: AUPRC={auprc}') plt.plot(recall, precision) plt.show() # Violin plot for DeepDRA scores prediction_targets = pd.DataFrame({}, columns=['Prediction', 'Target']) res = pd.concat( [pd.DataFrame(mlp_output.numpy(), ), pd.DataFrame(all_targets.numpy())], axis=1, ignore_index=True) res.columns = prediction_targets.columns prediction_targets = pd.concat([prediction_targets, res]) class_one = prediction_targets.loc[prediction_targets['Target'] == 0, 'Prediction'] class_minus_one = prediction_targets.loc[prediction_targets['Target'] == 1, 'Prediction'] fig, ax = plt.subplots() ax.set_ylabel("DeepDRA score") xticklabels = ['Responder', 'Non Responder'] ax.set_xticks([1, 2]) ax.set_xticklabels(xticklabels) data_to_plot = [class_minus_one, class_one] plt.ylim(0, 1) p_value = np.format_float_scientific(ttest_ind(class_one, class_minus_one)[1]) cancer = 'all' plt.title( f'Responder/Non-responder scores for {cancer} cancer with \np-value ~= {p_value[0]}e{p_value[-3:]} ') bp = ax.violinplot(data_to_plot, showextrema=True, showmeans=True, showmedians=True) bp['cmeans'].set_color('r') bp['cmedians'].set_color('g') plt.show() # Step 6: Return evaluation metrics in a dictionary return {'Accuracy': accuracy, 'Precision': precision, 'Recall': recall, 'F1 score': f1_score, 'AUC': auc, 'AUPRC': auprc} @staticmethod def add_results(result_list, current_result): result_list['AUC'].append(current_result['AUC']) result_list['AUPRC'].append(current_result['AUPRC']) result_list['Accuracy'].append(current_result['Accuracy']) result_list['Precision'].append(current_result['Precision']) result_list['Recall'].append(current_result['Recall']) result_list['F1 score'].append(current_result['F1 score']) return result_list @staticmethod def show_final_results(result_list): print("Final Results:") for i in range(len(result_list["AUC"])): accuracy = result_list['Accuracy'][i] precision = result_list['Precision'][i] recall = result_list['Recall'][i] f1_score = result_list['F1 score'][i] auc = result_list['AUC'][i] auprc = result_list['AUPRC'][i] print(f'Accuracy: {accuracy:.3f}, Precision: {precision:.3f}, Recall: {recall:.3f}, F1 score: {f1_score:.3f}, AUC: {auc:.3f}, ,AUPRC: {auprc:.3f}') avg_auc = np.mean(result_list['AUC']) avg_auprc = np.mean(result_list['AUPRC']) std_auprc = np.std(result_list['AUPRC']) print(" Average AUC: {:.3f} \t Average AUPRC: {:.3f} \t Std AUPRC: {:.3f}".format(avg_auc, avg_auprc, std_auprc))