149 lines
4.6 KiB
Python
149 lines
4.6 KiB
Python
import os
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import matplotlib.pyplot as plt
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import numpy as np
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from keras.utils import plot_model
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from sklearn.metrics import (
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auc, classification_report, confusion_matrix, fbeta_score, precision_recall_curve,
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roc_auc_score, roc_curve
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)
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def scores(y_true, y_pred):
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for (path, dirnames, fnames) in os.walk("results/"):
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for f in fnames:
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if path[-1] == "1" and f.endswith("npy"):
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y_pred = np.load(os.path.join(path, f)).flatten()
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print(path)
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tp = np.sum(np.logical_and(y_pred >= 0.5, y_true == 1))
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tn = np.sum(np.logical_and(y_pred < 0.5, y_true == 0))
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fp = np.sum(np.logical_and(y_pred >= 0.5, y_true == 0))
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fn = np.sum(np.logical_and(y_pred < 0.5, y_true == 1))
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precision = tp / (tp + fp)
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recall = tp / (tp + fn)
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accuracy = (tp + tn) / len(y_true)
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f1_score = 2 * (precision * recall) / (precision + recall)
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f05_score = (1 + 0.5 ** 2) * (precision * recall) / (0.5 ** 2 * precision + recall)
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print(" precision:", precision)
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print(" recall:", recall)
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print(" accuracy:", accuracy)
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print(" f1 score:", f1_score)
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print(" f0.5 score:", f05_score)
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def plot_precision_recall(mask, prediction, path):
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y = mask.flatten()
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y_pred = prediction.flatten()
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precision, recall, thresholds = precision_recall_curve(y, y_pred)
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decreasing_max_precision = np.maximum.accumulate(precision)[::-1]
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plt.clf()
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# fig, ax = plt.subplots(1, 1)
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# ax.hold(True)
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plt.plot(recall, precision, '--b')
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# ax.step(recall[::-1], decreasing_max_precision, '-r')
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plt.xlabel('Recall')
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plt.ylabel('Precision')
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plt.savefig(path, dpi=600)
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plt.close()
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def plot_precision_recall_curves(mask, prediction, path):
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y = mask.flatten()
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y_pred = prediction.flatten()
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precision, recall, thresholds = precision_recall_curve(y, y_pred)
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plt.clf()
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plt.plot(recall, label="Recall")
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plt.plot(precision, label="Precision")
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plt.xlabel('Threshold')
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plt.ylabel('Score')
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plt.savefig(path, dpi=600)
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plt.close()
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def score_model(y, prediction):
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y = y.flatten()
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y_pred = prediction.flatten()
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precision, recall, thresholds = precision_recall_curve(y, y_pred)
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print(classification_report(y, y_pred.round()))
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print("Area under PR curve", auc(recall, precision))
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print("roc auc score", roc_auc_score(y, y_pred))
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print("F1 Score", fbeta_score(y, y_pred.round(), 1))
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print("F0.5 Score", fbeta_score(y, y_pred.round(), 0.5))
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def plot_roc_curve(mask, prediction, path):
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y = mask.flatten()
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y_pred = prediction.flatten()
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fpr, tpr, thresholds = roc_curve(y, y_pred)
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roc_auc = auc(fpr, tpr)
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plt.clf()
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plt.plot(fpr, tpr)
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plt.savefig(path, dpi=600)
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plt.close()
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print("roc_auc", roc_auc)
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def plot_confusion_matrix(y_true, y_pred, path,
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normalize=False,
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title='Confusion matrix',
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cmap="Blues", dpi=600):
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"""
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This function prints and plots the confusion matrix.
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Normalization can be applied by setting `normalize=True`.
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"""
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plt.clf()
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cm = confusion_matrix(y_true, y_pred)
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classes = [0, 1]
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plt.imshow(cm, interpolation='nearest', cmap=cmap)
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plt.title(title)
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plt.colorbar()
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tick_marks = np.arange(len(classes))
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plt.xticks(tick_marks, classes, rotation=45)
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plt.yticks(tick_marks, classes)
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if normalize:
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cm = cm.astype('float') / cm.sum(axis=1)[:, np.newaxis]
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print("Normalized confusion matrix")
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else:
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print('Confusion matrix, without normalization')
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print(cm)
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thresh = cm.max() / 2.
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for i, j in ((i, j) for i in range(cm.shape[0]) for j in range(cm.shape[1])):
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plt.text(j, i, cm[i, j],
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horizontalalignment="center",
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color="white" if cm[i, j] > thresh else "black")
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plt.tight_layout()
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plt.ylabel('True label')
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plt.xlabel('Predicted label')
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plt.savefig(path, dpi=dpi)
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plt.close()
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def plot_training_curve(logs, key, path, dpi=600):
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plt.clf()
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plt.plot(logs[f"{key}_acc"], label="accuracy")
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plt.plot(logs[f"{key}_f1_score"], label="f1_score")
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plt.plot(logs[f"val_{key}_acc"], label="accuracy")
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plt.plot(logs[f"val_{key}_f1_score"], label="val_f1_score")
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plt.xlabel('epoch')
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plt.ylabel('percentage')
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plt.legend()
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plt.savefig(path, dpi=dpi)
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plt.close()
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def plot_model_as(model, path):
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plot_model(model, to_file=path, show_shapes=True, show_layer_names=True)
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