ML – 深度学习层列表

要指定所有层顺序连接的神经网络的架构，请直接创建一个层数组。要指定层可以具有多个输入或输出的网络架构，请使用 LayerGraph 对象。使用以下函数创建不同的图层类型。

输入层：

FUNCTION	DESCRIPTION
imageInputLayer	Inputs images to a network Applies data normalization .
sequenceInputLayer	Inputs sequence data to a network.

可学习层：

FUNCTION	DESCRIPTION
convolution2dLayer	Applies sliding filters to the input. It convolves the input by moving the filters along the input vertically and horizontally and computing the dot product of the weights and the input, and then adding a bias term.
transposedConv2dLayer	It upsamples feature maps.
fullyConnectedLayer	Multiplies the input by a weight matrix and then adds a bias vector .
lstmLayer	It is a recurrent neural network (RNN) layer that enables support for time series and sequence data in a network. It performs additive interactions, which can help improve gradient flow over long sequences during training. They are best suited for learning long-term dependencies .

激活层：

FUNCTION	DESCRIPTION
reluLayer	It performs a threshold operation to each element of the input, where any value less than zero is set to zero.
leakyReluLayer	It performs a simple threshold operation, where any input value less than zero is multiplied by a fixed scalar
clippedReluLayer	It performs a simple threshold operation, where any input value less than zero is set to zero. Any value above the clipping ceiling is set to that clipping ceiling.

归一化和 Dropout 层：

FUNCTION	DESCRIPTION
batchNormalizationLayer	It normalizes each input channel across a mini-batch. The layer first normalizes the activations of each channel by subtracting the mini-batch mean and dividing by the mini-batch standard deviation. Then, the layer shifts the input by a learnable offset and scales it by a learnable scale factor. Use batch normalization layers between convolutional layers and nonlinearities, such as ReLU layers, to speed up training of convolutional neural networks and reduce the sensitivity to network initialization.
crossChannelNormalizationLayer	It carries out channel-wise normalization.
dropoutLayer	It randomly sets input elements to zero with a given probability.

池化层：

FUNCTION	DESCRIPTION
averagePooling2dLayer	It performs down sampling by dividing the input into rectangular pooling regions and computing the average values of each region.
maxPooling2dLayer	It performs down sampling by dividing the input into rectangular pooling regions, and computing the maximum of each region.
maxUnpooling2dLayer	It unpools the output of a max pooling layer.

组合层：

FUNCTION	DESCRIPTION
additionLayer	It adds multiple inputs element-wise. Specify the number of inputs to the layer when you create it. The inputs have names ‘in1’, ‘in2’, …, ‘inN’, where N is the number of inputs. Use the input names when connecting or disconnecting the layer to other layers using connectLayers or disconnectLayers. All inputs to an addition layer must have the same dimension.
depthConcatenationLayer	It takes multiple inputs that have the same height and width. It concatenates them along the third dimension.

输出层：

FUNCTION	DESCRIPTION
softmaxLayer	It applies a softmax function to the input.
classificationLayer	It holds the name of the loss function the software uses for training the network for multiclass classification .
regressionLayer	It holds the name of the loss function the software uses for training the network for regression, and the response names.