# Tagged Questions

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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### How to do feature extraction

I have some images and I'd like to find generate features to compute a similarity metric. What is the Mathematica way to do this?
113 views

### Handwriting recognition with Mathematica

I am trying to teach Mathematica to read my handwriting. Since I don't want to ruin my reputation by showing my own handwriting, I am going to use a font called blackjack. Lets say this is a ...
70 views

### Geographic text recognition [closed]

I would like to process an image from this Wikipedia page to get the structured data out Like so <| "New York" -> 28, ... |> Not sure where to start.
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### Hidden Markov Model: emissions probabilities dependent on observable parameter

I need to fit an HMM where the emission probabilities (ep) are discrete and dependent on a known variable quantity. E.g.: Imagine a daily time series of binary emissions ("1" or "2"). I suppose an ...
105 views

### How to make classification results replicable?

Let's suppose I have a simple classification problem: ...
503 views

### How to perform convolutions on this complicated pdf?

For a known pdf f[x], I need to calculate integrals over the probability density of the sum of Log[f[x]] over independent samples: Q[t,n]\equiv P(\sum_{i=1}^{n}...
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### Softmax Regression Classification Algorithm

I'm following the Stanford Machine Learning course while simultaneously developing my Mathematica abilities. I'm having issues with my Softmax Classifier implementation (for ref, have a look at these ...
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### An example showcasing ValidationSet's utility

Validation sets form a fundamental part of machine learning by minimising overfitting but is there a nice example showcasing this effect when using Predict/...
141 views

### Locally Weighted Linear Regression

I am following the online Stanford Course in Machine Learning and I am trying to implement the algorithms on the fly in Mathematica. Currently, I have issues with minimizing the Locally Weighted ...
403 views

### Noise filtering in images with PCA

I have a stack of images (usually ca 100) of the same sample. The images have intrinsic variation of the sample, which is my signal, and a lot of statistical noise. I did a principal components ...
160 views

### Neural network playground

I came across this Neural Net Playground demonstration based on Google's Tensorflow package. It visualizes the data processing inside a neural network and allows you to tweak parameters and ...
150 views

### Classifying images in mass with URLs and CSV file

I'm looking to train a image classifier with a large number of examples and categories (30,000 & 100). I would then import a file of image URLs that need to be classified, and export the results. ...
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### How to compute scores with a ClassifierFunction's SVM?

I'm trying to understand the evaluation mechanism for ClassifierFunction. Here we train a simple linear SVM on some toy data: ...
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### Predict expand training data [closed]

Lets say I have a small set of training data and have calculated a Predictor function from this set. Is it possible to continue the training with a larger data set?
115 views

### How do I configure the input and output layers of a neural network?

I'm confused about how to set some of the basic properties of a neural network structure using Classify. I'm trying to set the basic properties of a simple neural ...
114 views

### Building a classifier for images

I tried to build a classifier for some images that I have with the following code: ...
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### Is the Method -> Automatic option for Classify not deterministic?

I just prepared an (well known) example in machine learning, the weather dependent determination of whether to play golf or not, as shown in this picture (of a corresponding Dataset) Now I set up ...
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### Normalize data in feature engineering

Here is the dataset to be used to train the model. ...
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### Google Cloud Vision vs ImageIdentify [closed]

Google has recently made their vision API publicly available (in beta release). I was hoping someone who has access to it could speak to how it compares with Mathematica's ...
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### Error when training support vector machine (SVM) classifier

I am running Classify function using a support vector machine model. I get an error that I can not fix. Here is my code. The data is imported from a file *.txt: <...
165 views

### How to implement QLearning?

I know that v10 has support for both Machine Learning and Finite Markov Processes, the Q-learning algorithm uses both. Specifically, Q-learning finds an optimal action-selection policy for any given (...
290 views

### How to do Independent Component Analysis?

The new experimental function in 10.3.1 DimensionReduce[], has the following three options for Method: ...
191 views

### How to get the training error and the validation error using Classify function with SVM

I am using Classify[] function with Support vector machine model. I need to analyze the quality of results by analyzing the training error and the validation error ...
121 views

### What are the time and space complexities of Classify/Predict?

Does anyone have knowledge of the O(n) time & space complexities for various model types supported by Classify[] and ...
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### How to import/export to libsvm?

Under the hood Mathematica uses libsvm, so I don't think this question is beyond the pale. I need to export an svm I trained with Classify to the standard SVM Format (which is readable by libsvm). ...
68 views

### Create an adequate 'training set' to train a ClassifierFunction which performs the role of the built-in SubsetQ

I am trying to "grow" my own SubsetQ function using Machine Learning methods. My cSubsetQ when given two lists (listA and listB)...
101 views

### Classification problem using SVM methods

I am running SVM on mathematica and I a used this code with classes: ...
111 views

### How is the multi-class support vector machine classifier implemented? [closed]

I am using support vector machine (SVM) method with Classify to do multi-class. Can anyone tell me the reference (paper) used by Wolfram Mathematica to develop the ...
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### Using Classifier with NearestNeighbors methods

I am using a Machine learning toolbox on mathematica. I have 8 classes. Training data: for each class, there 100 samples with size 160. I used this code. ...
106 views

### How to avoid crashing with ConformImages?

ConformImages[] is causing a kernel crash when applied to a list of 5k images. Is there any way to apply ConformImages on the list in batches or asynchronously to ...
214 views

### Pattern recognition

I am trying to have Mathematica come up with a simplified version of a real pattern. For the moment I'm trying with handwritten digits, but eventually I want to apply it to more complex photographs. ...
72 views

### How to do multilabel multioutput classification?

Classify doesn't work when the targets are lists, so you need to encode the labels. However, there must be a nicer built-in way to do label encoding than this, but ...
97 views

### What's the algorithm behind markov classifier in Classify function for text classification?

https://www.wolfram.com/mathematica/new-in-10/highly-automated-machine-learning/find-which-author-wrote-a-text.html The above url show the use of Classify ...
44 views

### How effect is the mathematica automatic machine learning function like Classify? [duplicate]

The documentation said use Classify, you will get state of the art machine learning result. But since the Classify function of ...
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### How to know the internal pre-processing of automatic machine learning function Classify?

In the Highly automatic machine learning page, it is said the function like Classify and Predict will do things like automatic ...
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### Uncorrected Versus Corrected Measures of StandardDeviation in PredictorMeasurements' “StandardDeviation”

When using Predict have noticed that the standard deviation of the residuals computed manually is not equal to the output from ...
590 views

### Is there any decent deep learning library in Mathematica? [closed]

Deep Learning is the currently trending method in machine learning community. Some languages like python and matlab have some very convenient toolbox for deep learning. So is there any decent deep ...
137 views

### FindFormula Control [closed]

FindFormula is great start on the path to full symbolic regression and I realize it's level of development is only experimental at this stage. But if I happen to ...
95 views

### How to ImageIdentify multiple objects in a single image?

Suppose an image has multiple objects: ImageIdentify only finds the banana: ...
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### What ratio of example per class gives best results and least overfitting?

For an n-class classifier or predictor, how many positive (or negative?) examples of each of the n classes should I put into my training and testing sets for the best results? I anticipate that ...
126 views

### Can Predict/Classify be parallelized?

Being able to parallelize Predict /Classify would be useful on multiple fronts: Performance/Scale Streaming Pedagogical ...
694 views

### How to detect loops in a vector field?

Given a vector field and I'd like to detect if there are streamlines in closed patterns. For example, if the input is a vector field like this: ...
298 views

### Inverse of Interpreter[“Color”]: Convert a RGBColor to a natural language color name

What is the best way to create the inverse function of Interpreter["Color"]? That function takes a natural language color name like ...
323 views

### How to monitor the progress of training a classifier?

I've had p = Predict[x -> y] running for hours and I have now idea if I should kill it or not. I'm looking for some rough bounds for an estimate of how long <...
842 views

### What is behind experimental function: FindFormula?

In version 10.2 there is a new experimental function: FindFormula[]. I suspect that a genetic programming algorithm (symbolic regression) is behind this new ...
640 views

### Trainable WEKA segmentation of images

Is there a Mathematica equivalent of Trainable WEKA Segmentation as implemented in Fiji, the image processing software? A Google search did not return any relevant links. I attach the original image ...