def fit(self, x, t, batch_size, epochs, validation=None, callbacks=None):
# コールバック関数
self.callbacks = callbacks
#-------------------------------
# Validation
#-------------------------------
if validation != None: # バリデーションが最初からセットされているとき
x_val = validation[0]
t_val = validation[1]
else:
x = __shuffle__(x)
t = __shuffle__(t)
#------------------
# Sorting
#------------------
# ホールドアウト法を採用
# 教師用データと検証用データを6:4で分割
thresh = int((x.shape[0] * 0.4))
x_val, x = __sorting__(x, thresh)
t_val, t = __sorting__(t, thresh)
loop = int(x.shape[0] / batch_size) # 繰り返し回数
#---------------------------
# メインルーチン
#---------------------------
for epoch in range(epochs):
loss_sum = 0
for j in range(loop):
# 行数からbatch_sizeだけランダムに値を抽出 replace(重複)
batch_mask = np.random.choice(x.shape[0],
batch_size,
replace=False)
x_batch = x[batch_mask] # 全データからbatch_size分データを抽出
t_batch = t[batch_mask]
grads = self.gradient(x_batch, t_batch)
self.func['optimizer'].update(self.params, grads)
#loss = self.gradient(x_batch, t_batch) # 誤差の計算
loss_sum += (self.history['loss'] / batch_size)
loss_ave = loss_sum / loop # 誤差の平均値の計算
self.history['loss_ave'].append(loss_ave) # 誤差の保存
#---------------------------
# validation誤差の計算
#---------------------------
val_loss = self.loss(x_val, t_val)
val_loss_ave = val_loss / x_val[0].shape[0]
self.history['val_loss'].append(val_loss_ave)
#---------------------------
# 正解率の計算
#---------------------------
# printで値を表示するためのリスト
prt_train_acc = []
prt_val_acc = []
logs = {}
for key, List in self.logs.items():
#metric = [x for x in self.metrics_func.keys() if x in key][0]
metric = [x for x in self.func.keys() if x in key][0]
if 'train' in key:
#acc_train = self.accuracy(x_batch, t_batch, self.metrics_func[metric])
acc_train = self.accuracy(x_batch, t_batch,
self.func[metric])
List.append(acc_train)
prt_train_acc.append(acc_train)
logs[key] = acc_train
if 'val' in key:
#acc_val = self.accuracy(x_val, t_val, self.metrics_func[metric])
acc_val = self.accuracy(x_val, t_val, self.func[metric])
List.append(acc_val)
prt_val_acc.append(acc_val)
logs[key] = acc_val
#---------------------------
# one_epoch_endコールバック
#---------------------------
if self.callbacks != None:
for call in callbacks:
call.one_epoch_end(logs)
#print('学習%d回目 --loss:%f, --val=%f, --train_acc=%f' % (i+1, self.history['loss_ave'][i], self.history['val_loss'][i], self.metrics_log['train'][i]))
print('学習%d回目 --loss:%f, --val=%f, --train_acc=%f, --val_acc=%f' % \
(epoch+1, self.history['loss_ave'][epoch], self.history['val_loss'][epoch], np.min(prt_train_acc), np.min(prt_val_acc)))
nb_epoch = epochs
plt.plot(range(nb_epoch),
self.history['loss_ave'],
marker='.',
label='loss')
plt.plot(range(nb_epoch),
self.history['val_loss'],
marker='.',
label='val_loss')
plt.legend(loc='best', fontsize=10)
plt.grid()
plt.xlabel('epoch')
plt.ylabel('loss')
# 再描画する
plt.pause(0.001)
plt.show()
print('loss=%f, val=%f' % (self.history['loss_ave'][epochs - 1],
self.history['val_loss'][epochs - 1]))
return self.history
def nn(x, t, batch_size, epochs, feature=None, validation=None):
"""
簡単なニューラルネットワークのモデルを作成する関数
Parameters
----------
x : ndarray
学習用データ
t : ndarray
教師データ
batch_size : int
バッチサイズ
eopchs : int
エポック数
feature : int
Feature Scalingの選択
"""
#-------------------------------
# DataFeature
#-------------------------------
if feature != None:
x = Datafeature(x, feature)
t = Datafeature(t, feature)
#-------------------------------
# Validation
#-------------------------------
if validation != None: # バリデーションが最初からセットされているとき
x_val = validation[0]
t_val = validation[1]
else:
x = __shuffle__(x)
t = __shuffle__(t)
x_val, x = __sorting__(x, 100)
t_val, t = __sorting__(t, 100)
# 学習曲線を可視化するコールバックを用意する
higher_better_metrics = ['r2']
visualize_cb = LearningVisualizationCallback(higher_better_metrics)
callbacks = [
visualize_cb,
]
model = Sequential()
model.add(Input(input_shape=x.shape[1]))
model.add(Dense(50, activation='relu', weight_initializer='relu'))
model.add(Dense(50, activation='relu', weight_initializer='relu'))
#model.add(Dense(50, activation='sigmoid', weight_initializer='sigmoid'))
#model.add(Dense(50, activation='sigmoid', weight_initializer='sigmoid'))
#model.add(Dense(t.shape[1], activation='softmax'))
#model.compile(loss='cross_entropy_error')
model.add(Dense(t.shape[1], activation = 'liner'))
model.compile(loss='mean_squared_error', metrics = ['r2', 'rsme'])
#history=model.fit(x, t, batch_size=batch_size, epochs=epochs, validation=validation)
history = model.fit(x, t, batch_size=batch_size,
epochs=epochs, validation=(x_val, t_val), callbacks=callbacks)
# lossグラフ
loss = history['loss_ave']
val_loss = history['val_loss']
nb_epoch = len(loss)
plt.plot(range(nb_epoch), loss, marker = '.', label = 'loss')
plt.plot(range(nb_epoch), val_loss, marker='.', label='val_loss')
plt.legend(loc = 'best', fontsize = 10)
plt.grid()
plt.xlabel('epoch')
plt.ylabel('loss')
plt.show()
def fit(self, x, t, batch_size, epochs, validation=None, callbacks=None):
# コールバック関数
"""
if callbacks != None:
one_epoch_end = []
for call in callbacks:
if ('one_epoch_end' in dir(call)):
one_epoch_end.append(call.one_epoch_end)
"""
#レイヤの行列を計算する
y = np.zeros((batch_size, x.shape[1]))
for layer in self.sequential.values():
y = layer.fit(y)
# バリデーションが最初からセットされているとき
if validation != None:
x_val = validation[0]
t_val = validation[1]
else:
x = __shuffle__(x)
t = __shuffle__(t)
x_val, x = __sorting__(x, 100)
t_val, t = __sorting__(t, 100)
loop = int(x.shape[0] / batch_size) # 繰り返し回数
# メインルーチン
for epoch in range(epochs):
loss_sum = 0
for j in range(loop):
# 行数からbatch_sizeだけランダムに値を抽出 replace(重複)
batch_mask = np.random.choice(x.shape[0],
batch_size,
replace=False)
x_batch = x[batch_mask] # 全データからbatch_size分データを抽出
t_batch = t[batch_mask]
loss = self.gradient(x_batch, t_batch) # 誤差の計算
loss_sum += (loss / batch_size)
loss_ave = loss_sum / loop # 誤差の平均値の計算
self.history['loss_ave'].append(loss_ave) # 誤差の保存
#---------------------------
# validation誤差の計算
#---------------------------
val_loss = self.loss(x_val, t_val)
val_loss_ave = val_loss / x_val[0].shape[0]
self.history['val_loss'].append(val_loss_ave)
#---------------------------
# 正解率の計算
#---------------------------
logs = {}
# printで値を表示するためのリスト
prt_train_acc = []
prt_val_acc = []
for key, List in self.logs.items():
metric = [x for x in self.metrics_func.keys() if x in key][0]
if 'train' in key:
acc = self.accuracy(x_batch, t_batch,
self.metrics_func[metric])
List.append(acc)
prt_train_acc.append(acc)
if 'val' in key:
acc = self.accuracy(x_val, t_val,
self.metrics_func[metric])
List.append(acc)
prt_val_acc.append(acc)
logs[key] = acc
#---------------------------
# one_epoch_endコールバック
#---------------------------
if callbacks != None:
for call in callbacks:
call.one_epoch_end(epoch, logs)
#print('学習%d回目 --loss:%f, --val=%f, --train_acc=%f' % (i+1, self.history['loss_ave'][i], self.history['val_loss'][i], self.metrics_log['train'][i]))
print('学習%d回目 --loss:%f, --val=%f, --train_acc=%f, --val_acc=%f' % \
(epoch+1, self.history['loss_ave'][epoch], self.history['val_loss'][epoch], np.min(prt_train_acc), np.min(prt_val_acc)))
print('loss=%f, val=%f' % (self.history['loss_ave'][epochs - 1],
self.history['val_loss'][epochs - 1]))
return self.history
