TensorFlow 是一个端到端开源机器学习平台
借助 TensorFlow，初学者和专家可以轻松地创建机器学习模型。请参阅以下几部分，了解如何开始使用。
import tensorflow as tf
mnist = tf.keras.datasets.mnist
(x_train, y_train),(x_test, y_test) = mnist.load_data()
x_train, x_test = x_train / 255.0, x_test / 255.0
model = tf.keras.models.Sequential([
tf.keras.layers.Flatten(input_shape=(28, 28)),
tf.keras.layers.Dense(128, activation='relu'),
tf.keras.layers.Dropout(0.2),
tf.keras.layers.Dense(10, activation='softmax')
])
model.compile(optimizer='adam',
loss='sparse_categorical_crossentropy',
metrics=['accuracy'])
model.fit(x_train, y_train, epochs=5)
model.evaluate(x_test, y_test)
针对专家
Subclassing API 提供了由运行定义的高级研究接口。为您的模型创建一个类，然后以命令方式编写前向传播。您可以轻松编写自定义层、激活函数和训练循环。请运行下面的“Hello World”示例，然后访问教程以了解详情。
class MyModel(tf.keras.Model):
def __init__(self):
super(MyModel, self).__init__()
self.conv1 = Conv2D(32, 3, activation='relu')
self.flatten = Flatten()
self.d1 = Dense(128, activation='relu')
self.d2 = Dense(10, activation='softmax')
def call(self, x):
x = self.conv1(x)
x = self.flatten(x)
x = self.d1(x)
return self.d2(x)
model = MyModel()
with tf.GradientTape() as tape:
logits = model(images)
loss_value = loss(logits, labels)
grads = tape.gradient(loss_value, model.trainable_variables)
optimizer.apply_gradients(zip(grads, model.trainable_variables))
常见问题的解决方案
浏览分步教程以帮助您完成项目。
Learn how to build recommendation systems using TensorFlow and other products.
See how developers are using them to solve real world problems across many domains and explore TensorFlow Hub’s pretrained models at hub.tensorflow.google.cn.
Explore the On-Device ML website where you can learn the benefits of integrating ML in your mobile and web apps, and find turnkey solutions for common ML scenarios and custom use cases.
Learn what’s available to developers when it comes to creating, understanding, and deploying models for a variety of different applications. From Responsible AI to TensorFlow 2.5, mobile devices, microcontrollers, and beyond.