Questions tagged [machine-learning]

Questions about machine learning functionality of Mathematica, for instance involving, but not restricted to, Predict, Classify, FindClusters and the various regression functions.

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46 views

Measurement of properties of custom classifying algorithm

I am interested in measuring my classifier algorithm. Therefore I look for something similar to ClassifierMeasurements, where I can put my predictions result and ...
5
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1answer
149 views

How to cluster a set of images?

I have a set of images (imgset) as Clearly, the classification list should be ...
1
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1answer
65 views

Issue fine-tuning a simple embedding network

I'm trying to learn an embedding on Cifar-10 by finetuning ResNet-50 with a few added layers: ...
4
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1answer
264 views

Detecting a pattern in a time series with a Neural Network

I new to working with Neural Networks and I want to detect a pattern in a time series and return some measure of the certainty/uncertainty when a pattern has been detected: ...
4
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1answer
133 views

How can I reproduce the result of AgeEstimation model in MXNet-Python?

How can I reproduce the result of AgeEstimation model in MXNet-Python? here is my repo about MXnet-Python codes to load Mathematica Models. I want the result of Mathematica and the result of MXNet-...
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473 views

Train your own CycleGAN style translator

I have a set of images (a few hundred) that represent a certain style and I would like to train an unpaired image to image translator with CycleGAN. I'm looking for a tutorial on how one would do ...
4
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0answers
144 views

YOLOv3 Netmodel?

I see that YOLOv2 is on the Wolfram net repo, but has anyone ported the new YOLO version 3 architecture into Mathematica?
8
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1answer
215 views

Dilation on 3D Images?

I need to apply a dilated convolution to a 3D image, but dilation values greater than 1 are not currently supported in v11.3: ...
3
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0answers
108 views

Can someone help me to understand sequence-to-sequence transformation using (Wolfram-specific) recurrent neural nets?

I've been learning about recurrent neural networks lately and I think I'm starting to get the basic idea of how they work. I'm particularly interested in the sequence transformation capabilities of ...
7
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1answer
1k views

Fashion segmentation with a neural net?

I would like to train a network that can parse clothing: Does anyone know of a fashion segmentation network with or without pre-trained weights available that I can use in Mathematica? Update: I ...
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0answers
48 views

Memory management using blocking but in vain

I have trained a classifier named c and want to apply it to testing set. However, due to the huge size of testing set, I have to make prediction in blocks/groups to ...
10
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1answer
3k views

How can image segmentation from UNET be improved?

EDIT 2: code can be found @ https://github.com/alihashmiii/UNet-Segmentation-Wolfram EDIT 1: applying Binarize to the masks after resizing helps to ensure the data for mask is binary I have made an ...
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2answers
147 views

Derivative of rectified linear unit in Mathematica?

I am following the artificial neural networks literature and apparently the latest trend is to use the rectified linear units (ReLU) as the activation functions for each neuron. I tried to take the ...
3
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1answer
165 views

Tutorial on net surgery?

I'm trying to replace the "fc1000" layer in a NetModel, what am I missing here: ...
3
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1answer
130 views

How exactly does NetTrain use a ValidationSet (can we reuse it as TestSet)?

Typically when you train a model you have three sets of data: training, validation, and testing - and they can’t be mixed, i.e. you can’t use images from one in the other. I want to know if the ...
10
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0answers
444 views

How to plug holes in an Image (with partial convolutions)?

NVIDIA recently published a new way to reconstruct images with holes. They use a new type of convolutional layer which is described in the paper Image Inpainting for Irregular Holes Using Partial ...
9
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1answer
213 views

NetEncoder for images of “Varying” dimension?

I'm looking for someway to do what this syntax "should" do: NetEncoder[{"Image", Automatic, ColorSpace -> "RGB"}] /@ imgs; The documentation states that ...
3
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1answer
66 views

Validation failed for ConvolutionLayer message?

I have a simple fully convolutional network and I'm trying to figure out why I get this error NetChain::valfail: Validation failed for ConvolutionLayer: kernel size 3*3 plus padding size 0*0 cannot ...
6
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1answer
346 views

FindFaces in Mathematica 11.3

I just upgraded to Mathematica 11.3. but now my FindFaces instructions do not work anymore. I guess they changed the syntax in 11.3. Here is the original code: <...
3
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1answer
130 views

how to use CatenateLayer to connect nodes within a NetChain

EDIT: Looking closely at my network I have a similar problem of providing inputs to the CropLayer function. The output from the pooling layer (node 30) and node 87 (activation) should feed to the ...
3
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1answer
39 views

How to replace all activations in a NetGraph?

I'm trying to replace all activation layers of a certain type, there must be a simpler way to do this? ...
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0answers
59 views

Unable to create ClassifierMeasurements for NetGraph

I am trying to check the accuracy of a neural network by using ClassifierMeasurements. I take the MNIST as example:- Code for setting ...
2
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1answer
60 views

Unable to create NetGraph

I am trying to perform deep learning classification in Mathematica. I noted that I am unable to create NetGraph even when I just follow the simple steps in the help ...
1
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1answer
99 views

Specify NetEncode's tokenization model?

NetEncoder[{"Tokens"}] uses WordData indices to tokenize an input string. But is there a way to tell ...
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0answers
65 views

BayesianMinimization not giving the optimal values

I was following the examples given in the BayesianMinimization documentation and I found that this function actually does not give me the minimal value (very close though). Can anyone help explain the ...
4
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2answers
170 views

NetTrain with multi-label data?

I'm attempting to do simple category recommendation on textual data. I have around 20k training samples of the form desc_String -> {tag1_String, tag2_String, ...}...
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0answers
179 views

Is is a bug when importing MXNet model?

There is a trained net:model.zip Using Python to make prediction: ...
2
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1answer
92 views

Plotting a precision recall curve?

I would like to plot some PR curves for a few different applications: results on a test set for a (multilabel multiclass) classifier results on a test set for a CBIR function that returns ranked ...
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1answer
166 views

How do I change activation function of LinearLayer[] in NetGraph

I want to analize a network such that all neurons of its hidden layers output LogisticSigmoid[w.x+b], which is one of the most common ouputs analized in a neuron. ...
3
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1answer
132 views

Single Neuron Dream Example (from Markus van Almsick's Presentation WTC 2017)

I'm teaching myself about Mathematica 11.3 Neural Net capabilities, and I can't get a demonstrably previously working example to work. I've been trying for quite a while without success. In Martin ...
5
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1answer
163 views

Custom Loss Layer to ignore ordering

I am trying to train a net that takes a sequence of numbers and gives a sequence of numbers. For example: ...
10
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1answer
221 views

Can one use NetTrain with two Nvidia GPUs?

I am thinking of buying another GPU to accelerate my training. Will I be able to call NetTrain with both GPUs ("TargetDevice"-> {"GPU", All})? Or would it be ...
3
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0answers
141 views

Image Segmentation: (Efficient Graph-Based)

This question is two-fold; First, it is about how to get the speed efficiency this algorithm should provide in Mathematica. In addition, it has a small question about the algorithm (Efficient Graph-...
1
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1answer
131 views

Using NetTrain with HDF5?

I have some nicely formatted training data in HDF5 files, i.e. the images and labels are serialized within the H5 file as groups and datasets. AFAIK NetTrain only ...
4
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1answer
64 views

How to restore trained classifier/predictor from persistent storage?

Mathematica 11.3 has the ability to store trained classifier/predictor in the notebook. But how can we restore it in the new session? Create notebook and measure it's size: ...
0
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0answers
51 views

Whats the best way to classify data for Fall detector device?

I would like to know what's the best way or the function to use to classify 2 files for a fall detection device. my first file contains only TDL (Normal Movements) values and the second contains only (...
8
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1answer
157 views

How to use a remote windows laptop for NetTrain?

I have a windows 10 laptop (with a gpu) at home and a macbook at my office, both with v11.3. What are steps to use the windows machine remotely for training? That is, I want to launch and run ...
2
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1answer
96 views

Error using accuracy and ConfusionMatrixPlot of ClassifierMeasurements

EDIT: Here is the complete code that i have used: ...
3
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0answers
246 views

Image Generator with a Neural Network (CIFAR-10)

As some of you may know, CIFAR-10 is a data base which has 60,000 images (which are 32x32 in size) of 10 different categories (airplane, dog, cat, frog, deer, bird, horse, ship, automobile and truck). ...
2
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2answers
134 views

ElementwiseLayer with Piecewise?

I need a specific custom activation function; how can I implement it with Piecewise? This is what I've tried (using the recommendation from this question): ...
3
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1answer
86 views

Using NetGraph as FeatureExtractor?

I'd like to compute FeatureDistance between two images with a NetGraph: rs = NetModel["ResNet-152 Trained on ImageNet Competition Data"]; fe = NetTake[rs, {1, -3}] ...
18
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0answers
168 views

Inefficient memory storage for Dataset

Why Dataset doesn't serialize its contents, isn't it the whole point? I expect it to behave similar to python's pandas.DataFrame,...
3
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0answers
95 views

How to perform unsupervised texture classification?

Consider a texture mixture (img) from Brodatz. I want to classify the five different texture patterns and segment the corresponding regions. Following this, I ...
13
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2answers
557 views

How to implement a triplet network with NetSharedArray?

In v11.3, NetSharedArray[] and NetInsertSharedArray[] give us a mechanism of sharing weights and biases across neural networks, ...
2
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1answer
58 views

How does DimensionReduce work for EventData?

My question is whether the use of DimensionReduce, for a simple example with Method -> "PrincipalComponentsAnalysis" is the ...
4
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0answers
336 views

Using Machine Learning techniques for text-analysis

I am analysing a bunch of tweets and I want to understand which political party the authors support. Let say, for example that I have five parties labelled by a number: ...
0
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0answers
70 views

Training speed of NetTrain on GPU

I have a model with NetTrain that works fine. However, as I increase the amount of training data, the number of inputs per second to my GPU drops very, very substantially. In fact, when I include all ...
3
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0answers
41 views

NetTrain doesn't accept sparse input?

The following code fails to execute: ...
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0answers
54 views

Neural Network and Enforce Positive Vector

I am trying to implement a neural network where I output a vector of 5 parameters each of which I know to be positive. I have code that works where I end up with an `"Output" -> 5.' However, after ...
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0answers
113 views

Change Loss Function in NetTrain

For a similar problem, I am trying to modify the code here (https://www.wolfram.com/language/11/image-and-signal-processing/image-recognition-using-deep-learning.html?product=mathematica) so that the ...