downloadTrainedNetwork not found (deep learning toolbox?)

Hi, I am a new MATLAB R2025a user and am trying to follow along this tutorial: https://www.mathworks.com/help/images/segment-3d-brain-tumor-using-deep-learning.html#Segment3DBrainTumorsUsingDeepLearningExample-3. When I try to run many of the functions, such as downloadTrainedNetwork, I get this message and find that the function is not defined. I'm having trouble finding documentation for this function online and often see it referred to as being included as a supplementary function in some of these tutorials, though I have not found a defined function. Can somebody help me find where these functions are defined? I have the Computer Vision, Deep Learning, and Image Processing Toolboxes installed.

'downloadTrainedNetwork' is used in the following examples:

Code Generation for Detect Defects on Printed Circuit Boards Using YOLOX Network

Detect Defects on Printed Circuit Boards Using YOLOX Network

Identify Defects in Air Compressors Using Spectrogram Images

Perform Instance Segmentation Using SOLOv2

Brain MRI Segmentation Using Pretrained 3-D U-Net Network

Breast Tumor Segmentation from Ultrasound Using Deep Learning

Brighten Extremely Dark Images Using Deep Learning

Cardiac Left Ventricle Segmentation from Cine-MRI Images Using U-Net Network

Classify Hyperspectral Images Using Deep Learning

Classify Tumors in Multiresolution Blocked Images

Detect Defects Using Tiled Training of EfficientAD Anomaly Detector

Localize Industrial Defects Using PatchCore Anomaly Detector

Detect Image Anomalies Using Explainable FCDD Network

Develop Camera Processing Pipeline Using Deep Learning

Quantify Image Quality Using Neural Image Assessment

3-D Brain Tumor Segmentation Using Deep Learning

Segment Lungs from CT Scan Using Pretrained Neural Network

Semantic Segmentation of Multispectral Images Using Deep Learning

Unsupervised Medical Image Denoising Using CycleGAN

Unsupervised Medical Image Denoising Using UNIT

Unsupervised Day-to-Dusk Image Translation Using UNIT

Answer 1

[Matt J]

This well get you all the required functions,

openExample('images_deeplearning/Segment3DBrainTumorsUsingDeepLearningExample')

[Lauren]

Hi Matt! Thank you for the quick response. The functions are now defined but I'm running into other errors with loading the data. Do you know if these are installation related or is there another way to solve them?

(1) Error using load

Unable to find file or directory '/Users/laurentso/Downloads/BraTS/brainTumorSegmentation3DUnet_v2.mat'.

Here, the downloadTrainedNetwork downloads the file brainTumorSegmentation3DUnet_v2.zip but fails to unzip or locate a .mat file.

(2) Error using matlab.io.internal.archive.checkFilename>downloadArchiveFile (line 81)

Function UNTAR was unable to read URL ''https://www.mathworks.com/supportfiles/vision/data/sampleBraTSTestSetValid.tar.gz''.

Error in matlab.io.internal.archive.checkFilename (line 51)

fullfilename = downloadArchiveFile(protocol, filename, functionName);

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Error in matlab.io.internal.archive.parseUnArchiveInputs (line 71)

[archiveFilename, url] = matlab.io.internal.archive.checkFilename(archiveFilename, validExtensions, archiveFcn, argName);

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Error in untar (line 10)

matlab.io.internal.archive.parseUnArchiveInputs(mfilename, tarFilename, ...

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Error in downloadBraTSSampleTestData (line 12)

untar(sampledata_url,destination);

[Matt J]

The code is trying to download data from MathwWorks and failing. MathWorks has had IT problems recently, and I guess they aren't fully resolved.