X, Y = np.meshgrid(np.linspace(-3, 3, 100), np.linspace(-3, 3, 100))
test_x = np.array([X.ravel(), Y.ravel()]).reshape(2, -1).T
# constructing NN
model = Neural_net(2, [10, 10, 10], 1)
model.add(['tanh', 'swish', 'relu'])
model.set_loss('binary_crossentropy')
optimizer = Adam(lr=0.1)
score_acc = []
#---learning----
for _ in range(max_iter):
grads = model.gradient(train_x, labels)
optimizer.update(model.params, grads)
score = model.accuracy(train_x, labels)
score_acc.append(np.asarray(score))
# plot the training data
plt.scatter(train_x[labels.ravel() == 0, 0],
train_x[labels.ravel() == 0, 1],
marker=".",
s=20,
color='b')
plt.scatter(train_x[labels.ravel() == 1, 0],
train_x[labels.ravel() == 1, 1],
marker="x",
s=20,
color='r')
'''#3 learning '''
for i in range(int(max_iter)):
batch_mask = np.random.choice(train_size, batch_size)
x_batch = X_train[batch_mask]
t_batch = to_categorical(train_t[batch_mask], cls_num=10)
# update weight matrix
grads = model.gradient(x_batch, t_batch)
optim.update(model.params, grads)
# get loss data
loss = model.loss(x_batch, t_batch)
train_loss.append(loss)
# get accuracy data
score = model.accuracy(x_batch, t_batch)
train_acc.append(score)
'''#4 drawing loss & accuracy data '''
# ----- loss data -----
fig1 = plt.figure(figsize=(13, 5)) # dpi=50
ax = fig1.add_subplot(121)
x = np.arange(max_iter)
ax.plot(x, train_loss, color='blue', marker="*", markersize=7, markevery=10)
plt.xlabel("iterations", fontsize=25)
plt.title("loss", fontsize=25)
plt.xlim([-5, 210])
plt.show()
# --- accuracy data ---
ax = fig1.add_subplot(122)
ax.plot(x,
for n,func in enumerate(multi_func,1):
train_y = func(train_x)
# plotting training data
ax = fig.add_subplot(2,2,n)
ax.scatter(train_x, train_y, s=12, color='blue')
# constructing NN
model = Neural_net(n_input=1, n_hidden=[10,10,10], n_output=1)
model.add(['tanh', 'tanh', 'sigmoid'])
model.set_loss('sum_squared_error')
optimizer = Adam(lr=0.1, beta_1=0.9, beta_2=0.95)
#-----learning------
for _ in range(int(max_iter)):
grads = model.gradient(train_x,train_y)
optimizer.update(model.params, grads)
score = model.accuracy(train_x, train_y)
train_acc[func_name[n-1]].append(score)
# prediction data
y = model(x)
ax.plot(x, y, 'r-')
plt.xticks([-1,0,1])
plt.yticks([0,0.5,1])
plt.ylim([-0.1, 1.1])
plt.subplots_adjust(wspace=0.2,hspace=0.3)
plt.show()
fig = plt.figure(figsize=(10,4))
ax = fig.add_subplot(111)
x = np.arange(max_iter)