def evaluate(model, name, test_set_x, test_set_y):
predictions_valid = model.predict(test_set_x)
evaluation.plot_confusion_matrix(test_set_y, predictions_valid, name)
evaluation.plot_confusion_matrix(test_set_y,
predictions_valid,
name,
normalize=True)
accuracy = accuracy_score(test_set_y, predictions_valid)
return accuracy
def visualize_results(results, test_set_y):
for result in results:
evaluation.plot_confusion_matrix(
test_set_y, result["results"]["predictions_valid"], result["name"])
evaluation.plot_confusion_matrix(
test_set_y,
result["results"]["predictions_valid"],
result["name"],
normalize=True)
def evaluate(model: Model, name: str, plot_title: str, test_set_x, test_set_y,
batch_size: int, cnn: bool):
test_set_y_encoded = to_categorical(test_set_y)
if cnn:
test_set_x = np.expand_dims(test_set_x, axis=2)
loss, accuracy = model.evaluate(test_set_x,
test_set_y_encoded,
batch_size=batch_size,
verbose=2)
y_pred_encoded = model.predict(test_set_x)
y_pred = predicted_to_label(y_pred_encoded)
evaluation.plot_confusion_matrix(test_set_y,
y_pred,
name,
title=plot_title)
evaluation.plot_confusion_matrix(test_set_y,
y_pred,
name,
title=plot_title,
normalize=True)
return loss, accuracy
def train_neural_network(x_train, train_labels, x_test, orig_test):
"""
Trains neural network ready-to-use dataframes
Args:
X_train: train dataset
train_labels: train labels
X_test: test dataset
"""
train_features = np.array(x_train)
test_features = np.array(x_test)
train_labels = np.array(train_labels['Col2'])
model = models.make_model(params=train_features,
model_name='neural_network_1')
checkpoint_cb, tensorboard_cb = models.callbacks(
model_name='nn_submission03_s_1_m1_f_2165.ckpt')
epochs = 6
batch_size = 32
history = model.fit(train_features,
train_labels,
batch_size=batch_size,
epochs=epochs,
callbacks=[checkpoint_cb, tensorboard_cb]
# validation_data=(val_features, val_labels)
)
evaluation.evaluation(model, train_features, train_labels)
evaluation.plot_metrices(epochs, history, if_val=False)
evaluation.plot_confusion_matrix(model, train_features, train_labels)
evaluation.submission_nn(
model=model,
test_features=test_features,
orig_test_df=orig_test,
submission_name='nn_submission03_s_1_m1_f_2165.csv')
] #it should be normal and abnormal for linux machines
#print classification report
print(
classification_report(Y_valid.argmax(axis=-1),
y_pred.argmax(axis=-1),
target_names=target_names))
# Compute confusion matrix
cnf_matrix = confusion_matrix(Y_valid.argmax(axis=-1), y_pred.argmax(axis=-1))
np.set_printoptions(precision=4)
# Plot non-normalized confusion matrix
plt.figure(figsize=(15, 10), dpi=300)
plot_confusion_matrix(cnf_matrix,
classes=target_names,
title='Confusion matrix, without normalization')
# Plot normalized confusion matrix
plt.figure()
plot_confusion_matrix(cnf_matrix,
classes=target_names,
normalize=True,
title='Normalized confusion matrix')
plt.show()
###############################################################################
# transfer it back
y_pred = np.argmax(y_pred, axis=1)
Y_valid = np.argmax(Y_valid, axis=1)
print(y_pred)
print(y_pred)
print(Y_test)
np.savetxt('custom_model_y_pred.csv',y_pred,fmt='%i',delimiter = ",")
np.savetxt('custom_model_Y_test.csv',Y_test,fmt='%i',delimiter = ",")
#################compute confusion matrix######################################
#plot the confusion matrix
target_names = ['class 0(abnormal)', 'class 1(normal)']
print(classification_report(Y_test,y_pred,target_names=target_names))
print(confusion_matrix(Y_test,y_pred))
cnf_matrix = (confusion_matrix(Y_test,y_pred))
np.set_printoptions(precision=4)
plt.figure(figsize=(20,10), dpi=300)
# Plot non-normalized confusion matrix
plot_confusion_matrix(cnf_matrix, classes=target_names,
title='Confusion matrix')
plt.show()
###############################################################################
# visualizing losses and accuracy
train_loss=hist.history['loss']
val_loss=hist.history['val_loss']
train_acc=hist.history['acc']
val_acc=hist.history['val_acc']
xc=range(num_epoch)
plt.figure(1,figsize=(20,10), dpi=300)
plt.plot(xc,train_loss)
plt.plot(xc,val_loss)
plt.xlabel('num of Epochs')
plt.ylabel('loss')
plt.title('train_loss vs val_loss')
def evaluate(hist, pred, truth):
# compute the ROC-AUC values
fpr = dict()
tpr = dict()
roc_auc = dict()
for i in range(param['classes']):
fpr[i], tpr[i], _ = roc_curve(truth[:, i], pred[:, i])
roc_auc[i] = auc(fpr[i], tpr[i])
# Compute micro-average ROC curve and ROC area
fpr["micro"], tpr["micro"], _ = roc_curve(truth.ravel(), pred.ravel())
roc_auc["micro"] = auc(fpr["micro"], tpr["micro"])
# Plot ROC curves
plt.figure(figsize=(15, 10), dpi=300)
lw = 1
plt.plot(fpr[1],
tpr[1],
color='red',
lw=lw,
label='ROC curve (area = %0.4f)' % roc_auc[1])
plt.plot([0, 1], [0, 1], color='black', lw=lw, linestyle='--')
plt.xlim([0.0, 1.0])
plt.ylim([0.0, 1.05])
plt.xlabel('False Positive Rate')
plt.ylabel('True Positive Rate')
plt.title('Receiver operating characteristics')
plt.legend(loc="lower right")
plt.show()
# computhe the cross-entropy loss score
score = log_loss(truth, pred)
print(score)
# compute the average precision score
prec_score = average_precision_score(truth, pred)
print(prec_score)
# compute the accuracy on validation data
test_accuracy = accuracy_score(truth.argmax(axis=-1), pred.argmax(axis=-1))
print("Test_Accuracy = ", test_accuracy)
# declare target names
target_names = ['class 0(abnormal)', 'class 1(normal)'
] # it should be normal and abnormal for linux machines
# print classification report
print(
classification_report(truth.argmax(axis=-1),
pred.argmax(axis=-1),
target_names=target_names))
# Compute confusion matrix
cnf_matrix = confusion_matrix(truth.argmax(axis=-1), pred.argmax(axis=-1))
np.set_printoptions(precision=4)
# Plot non-normalized confusion matrix
plt.figure(figsize=(15, 10), dpi=300)
plot_confusion_matrix(cnf_matrix,
classes=target_names,
title='Confusion matrix, without normalization')
# Plot normalized confusion matrix
plt.figure()
plot_confusion_matrix(cnf_matrix,
classes=target_names,
normalize=True,
title='Normalized confusion matrix')
plt.show()
# transfer it back
pred = np.argmax(pred, axis=1)
truth = np.argmax(truth, axis=1)
print(pred)
print(truth)
# visualizing losses and accuracy
train_loss = hist.history['loss']
val_loss = hist.history['val_loss']
train_acc = hist.history['acc']
val_acc = hist.history['val_acc']
xc = range(param['num_epoch'])
plt.figure(1, figsize=(15, 10), dpi=300)
plt.plot(xc, train_loss)
plt.plot(xc, val_loss)
plt.xlabel('num of Epochs')
plt.ylabel('loss')
plt.title('train_loss vs val_loss')
plt.grid(True)
plt.legend(['train', 'val'])
plt.style.use('classic')
plt.figure(2, figsize=(15, 10), dpi=300)
plt.plot(xc, train_acc)
plt.plot(xc, val_acc)
plt.xlabel('num of Epochs')
plt.ylabel('accuracy')
plt.title('train_acc vs val_acc')
plt.grid(True)
plt.legend(['train', 'val'], loc=4)
plt.style.use('classic')
plt.show()
def main():
# Command line Interface
parser = argparse.ArgumentParser()
parser.add_argument('-d',
'--dirpath',
default=DATASETS_DIRPATH,
help="dataset directory path")
parser.add_argument('-n',
'--n_train',
default=None,
type=int,
help="number of rows to download on the train dataset")
parser.add_argument('-t',
'--n_test',
default=None,
type=int,
help="number of rows to download on the test dataset")
parser.add_argument('-e',
"--epochs",
default=3,
type=int,
help="set the number of epochs")
parser.add_argument('-b',
"--batch_size",
default=86,
type=int,
help="set batch size")
cli = parser.parse_args()
# Download and clean train dataset
train = DataSet(dirpath=cli.dirpath, filename="train.csv")
train.download(nrows=cli.n_train)
train.split_X_Y()
train.normalize()
train.reshape()
train.convert_digits_to_one_hot_vectors()
print(train)
# Split trian/validation datasets
validation = train.extract_validation(size=0.1)
print(validation)
# Download clean test dataset
test = DataSet(dirpath=cli.dirpath, filename="test.csv")
test.download(nrows=cli.n_test)
test.set_X()
test.normalize()
test.reshape()
print(test)
# Setup convolutional neural network model
model = Sequential()
model.add(
Conv2D(filters=32,
kernel_size=(5, 5),
padding='Same',
activation='relu',
input_shape=(28, 28, 1)))
model.add(
Conv2D(filters=32,
kernel_size=(5, 5),
padding='Same',
activation='relu'))
model.add(MaxPool2D(pool_size=(2, 2)))
model.add(Dropout(0.25))
model.add(
Conv2D(filters=64,
kernel_size=(3, 3),
padding='Same',
activation='relu'))
model.add(
Conv2D(filters=64,
kernel_size=(3, 3),
padding='Same',
activation='relu'))
model.add(MaxPool2D(pool_size=(2, 2), strides=(2, 2)))
model.add(Dropout(0.25))
model.add(Flatten())
model.add(Dense(256, activation="relu"))
model.add(Dropout(rate=0.5))
model.add(Dense(10, activation="softmax"))
# Define the optimizer
optimizer = RMSprop(lr=0.001, rho=0.9, epsilon=1e-08, decay=0.0)
# Compile the model
model.compile(optimizer=optimizer,
loss="categorical_crossentropy",
metrics=["accuracy"])
# Set learning rate decay
learning_rate_reduction = ReduceLROnPlateau(monitor='val_acc',
patience=3,
verbose=1,
factor=0.5,
min_lr=0.00001)
# Perform synthetic data augmentation
data_generator = ImageDataGenerator(
featurewise_center=False, # set input mean to 0 over the dataset
samplewise_center=False, # set each sample mean to 0
featurewise_std_normalization=
False, # divide inputs by std of the dataset
samplewise_std_normalization=False, # divide each input by its std
zca_whitening=False, # apply ZCA whitening
rotation_range=
10, # randomly rotate images in the range (degrees, 0 to 180)
zoom_range=0.1, # Randomly zoom image
width_shift_range=
0.1, # randomly shift images horizontally (fraction of total width)
height_shift_range=
0.1, # randomly shift images vertically (fraction of total height)
horizontal_flip=False, # randomly flip images
vertical_flip=False # randomly flip images
)
data_generator.fit(train.X)
history = model.fit_generator(
data_generator.flow(train.X, train.Y, batch_size=cli.batch_size),
epochs=cli.epochs,
validation_data=(validation.X, validation.Y),
verbose=2,
steps_per_epoch=train.X.shape[0] // cli.batch_size,
callbacks=[learning_rate_reduction])
# plot loss and accuracy
evaluation.plot_loss_and_accuracy(history)
# Predict digits for the validation dataset
prediction = DataSet()
prediction.Y = model.predict(validation.X)
prediction.X = validation.X
prediction.convert_one_hot_vectors_to_digits()
validation.convert_one_hot_vectors_to_digits()
confusion_mtx = confusion_matrix(validation.Y, prediction.Y)
evaluation.plot_confusion_matrix(confusion_mtx)
# Predict results
results = model.predict(test.X)
results = convert_one_hot_vectors_to_digits(results)
print(results)
# Generate Submission file
submission_file = Submission(results)
submission_file.save()
def TestModel(self,
sess,
writer,
datapath='',
str_dataset='eval',
data_count=32,
out_report=False,
show_ratio=True,
step=0):
'''
测试检验模型效果
'''
data = DataSpeech(datapath, str_dataset)
# data.LoadDataList(str_dataset)
num_data = sum(data.DataNum) # 获取数据的数量
if (data_count <= 0 or data_count >
num_data): # 当data_count为小于等于0或者大于测试数据量的值时，则使用全部数据来测试
data_count = num_data
try:
ran_num = random.randint(0, num_data - 1) # 获取一个随机数
overall_p = 0
overall_n = 0
overall_tp = 0
overall_tn = 0
accuracy = 0
sensitivity = 0
specificity = 0
score = 0
nowtime = time.strftime('%Y%m%d_%H%M%S',
time.localtime(time.time()))
txt_obj = []
if (out_report == True):
txt_obj = open('Test_Report_' + str_dataset + '_' + nowtime +
'.txt',
'w',
encoding='UTF-8') # 打开文件并读入
start = time.time()
cm_pre = []
cm_lab = []
map = {0: 'normal', 1: 'bowel sounds'}
# data_count = 200
for i in tqdm(range(data_count)):
data_input, data_labels = data.GetData(
(ran_num + i) % num_data,
mode='non-repetitive') # 从随机数开始连续向后取一定数量数据
predictions = []
if PRIOR_ART == False:
if len(data_input) <= AUDIO_LENGTH:
data_in = np.zeros(
(1, AUDIO_LENGTH, AUDIO_FEATURE_LENGTH, 1),
dtype=np.float)
data_in[0, 0:len(data_input)] = data_input
data_pre = self.model.predict_on_batch(data_in)
predictions = np.argmax(data_pre[0], axis=0)
else:
assert (0)
else:
data_pre = self.model.predict_on_batch(
np.expand_dims(data_input, axis=0))
predictions = np.argmax(data_pre[0], axis=0)
# print('predictions:',predictions)
# print('data_pre:',np.argmax(data_pre[0], axis=0))
# print ('data_label:',data_labels[0])
cm_pre.append(map[predictions])
cm_lab.append(map[data_labels[0]])
tp, fp, tn, fn = Compare2(predictions,
data_labels[0]) # 计算metrics
overall_p += tp + fn
overall_n += tn + fp
overall_tp += tp
overall_tn += tn
txt = ''
if (out_report == True):
txt += str(i) + '\n'
txt += 'True:\t' + str(data_labels) + '\n'
txt += 'Pred:\t' + str(data_pre) + '\n'
txt += '\n'
txt_obj.write(txt)
if overall_p != 0:
sensitivity = overall_tp / overall_p * 100
sensitivity = round(sensitivity, 2)
else:
sensitivity = 'None'
if overall_n != 0:
specificity = overall_tn / overall_n * 100
specificity = round(specificity, 2)
else:
specificity = 'None'
if sensitivity != 'None' and specificity != 'None':
score = (sensitivity + specificity) / 2
score = round(score, 2)
else:
score = 'None'
accuracy = (overall_tp + overall_tn) / (overall_p +
overall_n) * 100
accuracy = round(accuracy, 2)
end = time.time()
dtime = round(end - start, 2)
# print('*[测试结果] 片段识别 ' + str_dataset + ' 敏感度：', sensitivity, '%, 特异度： ', specificity, '%, 得分： ', score, ', 准确度： ', accuracy, '%, 用时: ', dtime, 's.')
strg = '*[测试结果] 片段识别 {0} 敏感度：{1}%, 特异度： {2}%, 得分： {3}, 准确度： {4}%, 用时: {5}s.'.format(
str_dataset, sensitivity, specificity, score, accuracy, dtime)
tqdm.write(strg)
assert (len(cm_lab) == len(cm_pre))
img_cm = plot_confusion_matrix(cm_lab,
cm_pre,
list(map.values()),
tensor_name='MyFigure/cm',
normalize=False)
writer.add_summary(img_cm, global_step=step)
summary = tf.Summary()
summary.value.add(tag=str_dataset + '/sensitivity',
simple_value=sensitivity)
summary.value.add(tag=str_dataset + '/specificity',
simple_value=specificity)
summary.value.add(tag=str_dataset + '/score', simple_value=score)
summary.value.add(tag=str_dataset + '/accuracy',
simple_value=accuracy)
writer.add_summary(summary, global_step=step)
if (out_report == True):
txt = '*[测试结果] 片段识别 ' + str_dataset + ' 敏感度：' + sensitivity + '%, 特异度： ' + specificity + '%, 得分： ' + score + ', 准确度： ' + accuracy + '%, 用时: ' + dtime + 's.'
txt_obj.write(txt)
txt_obj.close()
metrics = {
'data_set': str_dataset,
'sensitivity': sensitivity,
'specificity': specificity,
'score': score,
'accuracy': accuracy
}
return metrics
except StopIteration:
print('[Error] Model Test Error. please check data format.')