Predict

Predict responses using a trained deep learning neural network

• Library:

• Deep Learning Toolbox / Deep Neural Networks

• 

×

Description

The Predict block predicts responses for the data at the input by using the trained network specified through the block parameter. This block allows loading of a pretrained network into the Simulink^® model from a MAT-file or from a MATLAB^® function.

Note

The Predict block does not support dlnetwork object.

Ports

Input

input — Image or sequence or time series data

numeric array

The input ports of the Predict block takes the names of the input layers of the network that loaded. For example, if you specify googlenet for MATLAB function, then the input port of the Predict block is labeled data. Based on the network loaded, the input to the predict block can be image, sequence, or time series data.

The format of the input depend on the type of data.

Data	Format of Predictors
2-D images	A h-by-w-by-c-by-N numeric array, where h, w, and c are the height, width, and number of channels of the images, respectively, and N is the number of images.
Vector sequence	c-by-s matrices, where c is the number of features of the sequences and s is the sequence length.
2-D image sequences	h-by-w-by-c-by-s arrays, where h, w, and c correspond to the height, width, and number of channels of the images, respectively, and s is the sequence length.

If the array contains NaNs, then they are propagated through the network.

Output

output — Predicted scores, responses, or activations

numeric array

The outputs port of the Predict block takes the names of the output layers of the network loaded. For example, if you specify googlenet for MATLAB function, then the output port of the Predict block is labeled output. Based on the network loaded, the output of the Predict block can represent predicted scores or responses.

Predicted scores or responses, returned as a N-by-K array, where N is the number of observations, and K is the number of classes.

If you enable Activations for a network layer, the Predict block creates a new output port with the name of the selected network layer. This port outputs the activations from the selected network layer.

The activations from the network layer is returned as a numeric array. The format of output depends on the type of input data and the type of layer output.

For 2-D image output, activations is an h-by-w-by-c-by-n array, where h, w, and c are the height, width, and number of channels for the output of the chosen layer, respectively, and n is the number of images.

For a single time-step containing vector data, activations is a c-by-n matrix, where n is the number of sequences and c is the number of features in the sequence.

For a single time-step containing 2-D image data, activations is a h-by-w-by-c-by-n array, where n is the number of sequences, h, w, and c are the height, width, and the number of channels of the images, respectively.

Parameters

Network — Source for trained network

Network from MAT-file (default) | Network from MATLAB function | squeezenet

Specify the source for the trained network. Select one of the following:

• Network from MAT-file— Import a trained network from a MAT-file containing a SeriesNetwork or a DAGNetwork object.

• Network from MATLAB function— Import a pretrained network from a MATLAB function. For example, by using the googlenet function.

File path — MAT-file containing trained network

untitled.mat (default) | MAT-file name

This parameter specifies the name of the MAT-file that contains the trained deep learning network to load. If the file is not on the MATLAB path, use the Browse button to locate the file.

Dependencies

To enable this parameter, set the Network parameter to Network from MAT-file.

MATLAB function — MATLAB function name

squeezenet (default) | MATLAB function name

This parameter specifies the name of the MATLAB function for the pretrained deep learning network. For example, use googlenet function to import the pretrained GoogLeNet model.

Dependencies

To enable this parameter, set the Network parameter to Network from MATLAB function.

Mini-batch size — Size of mini-batches

128 (default) | positive integer

Size of mini-batches to use for prediction, specified as a positive integer. Larger mini-batch sizes require more memory, but can lead to faster predictions.

Predictions — Output predicted scores or responses

off (default) | on

Enable output ports that return predicted scores or responses.

Activations — Output network activations for a specific layer

Layers of the network

Use the Activations list to select the layer to extract features from. The selected layers appear as an output port of the Predict block.

Model Examples

Lane and Vehicle Detection in Simulink Using Deep Learning

Use deep convolutional neural networks inside a Simulink® model to perform lane and vehicle detection. This example takes the frames from a traffic video as an input, outputs two lane boundaries that correspond to the left and right lanes of the ego vehicle, and detects vehicles in the frame.

Extended Capabilities

C/C++ Code Generation

Generate C and C++ code using Simulink® Coder™.

Usage notes and limitations:

• The Language parameter in the Configuration Parameters > Code Generation general category must be set to C++.

• For a list of networks and layers supported for code generation, see Networks and Layers Supported for C++ Code Generation (MATLAB Coder).

GPU Code Generation

Generate CUDA® code for NVIDIA® GPUs using GPU Coder™.

Usage notes and limitations:

• The Language parameter in the Configuration Parameters > Code Generation general category must be set to C++.

• For a list of networks and layers supported for CUDA^® code generation, see Supported Networks and Layers (GPU Coder).

• To learn more about generating code for Simulink models containing the Predict block, see Code Generation for a Deep Learning Simulink Model that Performs Lane and Vehicle Detection (GPU Coder).