def accuracy(confusion_matrix):
tn, fp, fn, tp = confusion_matrix.ravel()
PPV = tp / (tp + fp)
sensitivity = tp / (tp + fn)
specificity = tn / (tn + fp)
NPV = tn / (fn + tn)
pos_lr = sensitivity / (1 - specificity)
neg_lr = (1 - sensitivity) / specificity
recall = tp / (tp + fn)
precison = tp / (tp + fp)
f1 = (2 * precison * recall)/(precison + recall)
print("*F1: %f *Sensitivity: %f *Specificity: %f *PPV: %f *NPV: %f *Positive-LR: %f *Negative-LR: %f" %
(f1, sensitivity, specificity, PPV, NPV, pos_lr, neg_lr))
diagonal_sum = confusion_matrix.trace()
sum_of_all_elements = confusion_matrix.sum()
return diagonal_sum / sum_of_all_elements
def accuracy(confusion_matrix): diagonal_sum = confusion_matrix.trace() sum_of_all_elements = confusion_matrix.sum() return diagonal_sum / sum_of_all_elements
def accuracy(confusion_matrix):
print("acc starts")
diagonal_sum = confusion_matrix.trace()
sum_of_all_elements = confusion_matrix.sum()
return diagonal_sum / sum_of_all_elements
def accuracy(confusion_matrix):
#It contains true positive, true negative, false positive and false negatives. Thus this matrix can be used to find accuracy, recall, etc.
diagonal_sum = confusion_matrix.trace()
sum_of_all_elements = confusion_matrix.sum()
return diagonal_sum / sum_of_all_elements #formula for accuracy
def accuracy(
confusion_matrix
): # accuracy: total number of all correct predictions/ total number of dataset
diagonal_sum = confusion_matrix.trace()
sum_of_all_elements = confusion_matrix.sum()
return diagonal_sum / sum_of_all_elements
def accuracy(confusion_matrix):
diagonal = confusion_matrix.trace()
elements = confusion_matrix.sum()
return diagonal / elements
def get_cm_metrics(confusion_matrix, labels, verbose=False):
n = len(labels)
cm_total = confusion_matrix.sum()
chance_agree = 0
agree = confusion_matrix.trace() / cm_total
supports = [0] * n
vp = [0] * n
fp = [0] * n
fn = [0] * n
precisions = [0] * n
recalls = [0] * n
fscores = [0] * n
label_true_sum = [0] * n
label_pred_sum = [0] * n
for row in range(n):
for column in range(n):
value = confusion_matrix[row][column]
supports[row] += value
label_true_sum[row] += value
label_pred_sum[column] += value
if row == column:
vp[row] += value
else:
fp[column] += value
fn[row] += value
for x in range(n):
recalls[x] = vp[x] / (vp[x] + fn[x])
precisions[x] = vp[x] / (vp[x] + fp[x])
if precisions[x] == 0 or recalls[x] == 0:
fscores[x] = 0
else:
fscores[x] = 2 * (precisions[x] * recalls[x]) / \
(precisions[x] + recalls[x])
prob_label_true = label_true_sum[x] / cm_total
prob_label_pred = label_pred_sum[x] / cm_total
chance_agree += prob_label_true * prob_label_pred
if verbose:
print()
print(''.rjust(30), 'precision'.rjust(10), 'recall'.rjust(
10), 'f1-score'.rjust(10), 'support'.rjust(10))
print()
for x in range(n):
print(labels[x].ljust(30),
'{:.2f}'.format(precisions[x]).rjust(10),
'{:.2f}'.format(recalls[x]).rjust(10),
'{:.2f}'.format(fscores[x]).rjust(10),
'{}'.format(supports[x]).rjust(10))
print()
accuracy = sum(vp) / sum(supports)
avg_fscore = sum(fscores) / n
kappa_score = (agree - chance_agree) / (1 - chance_agree)
return {
'F1_scores': fscores,
'accuracy': accuracy,
'macro_F1': avg_fscore,
'supports': supports,
'precisions': precisions,
'recalls': recalls,
'kappa': kappa_score,
}
def compute_accuracy(self, confusion_matrix: np.array):
"""
Total number of TP divided by the total length of X_test.
"""
return confusion_matrix.trace() / confusion_matrix.sum()
def accuracy(confusion_matrix):
diagonal_sum = confusion_matrix.trace()
print('Diagonal Sum is : ', diagonal_sum)
sum_of_all_elements = confusion_matrix.sum()
return diagonal_sum / sum_of_all_elements