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.
670
questions
4
votes
0
answers
244
views
Classification problem using SVM methods
I am running SVM on mathematica and I a used this code with classes:
...
4
votes
0
answers
378
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 ...
6
votes
0
answers
136
views
How can I change the distance function in Classify when using NearestNeighbor?
Issue not present in version "10.4.1 for Linux x86 (64-bit) (April 11, 2016)"
...
1
vote
0
answers
111
views
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.
...
2
votes
1
answer
234
views
Convert table data to Classifier data
I want to convert excel data into Classifier acceptable data. For Eg, the inbuilt Titanic data for Classifier is structured as below:
{"1st", 29., "female"} -> "survived"
I have 4 columns in Excel ...
10
votes
1
answer
2k
views
How can I determine the importance of variables from Classify?
I have used the "RandomForest" method in Classify to classify my response variable (nominal with 2 levels). Can Classify, like ...
5
votes
1
answer
135
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 ...
3
votes
0
answers
574
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.
...
2
votes
1
answer
202
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 ...
15
votes
1
answer
5k
views
How to visualize a random forest classifier?
I'd like to recreate this visualization (from python) in Mathematica:
I'm not sure how to extract the decision boundaries from a classifier with "Method" set to "RandomForest".
Here's the code:
<...
1
vote
0
answers
359
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 ...
1
vote
0
answers
62
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 ...
8
votes
1
answer
468
views
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 ...
2
votes
1
answer
669
views
Turning table into association for Classify
I have the following sample data for 20 users. I know their sex, and the response for three yes/no questions. I am trying to building a classifier to guess their response to the third question, based ...
1
vote
0
answers
580
views
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 ...
14
votes
1
answer
2k
views
Is there any decent deep learning library in Mathematica?
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 ...
8
votes
0
answers
581
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 ...
7
votes
1
answer
642
views
How to ImageIdentify multiple objects in a single image?
Suppose an image has multiple objects:
ImageIdentify only finds the banana:
...
3
votes
0
answers
85
views
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 ...
12
votes
1
answer
390
views
Can Predict/Classify be parallelized?
Being able to parallelize Predict /Classify would be useful on multiple fronts:
Performance/Scale
Streaming
Pedagogical
...
14
votes
2
answers
1k
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:
...
15
votes
3
answers
1k
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 ...
12
votes
1
answer
461
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 <...
1
vote
3
answers
864
views
Identify a scalar, a list
I have a symbolic scalar m2 and a symbolic list (representing a 3x3 matrix) A. I want a function which does something like:
<...
37
votes
3
answers
3k
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 ...
16
votes
2
answers
2k
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 ...
83
votes
8
answers
15k
views
What are the Wolfram Language's relative strengths for machine learning?
I see a low use of Mathematica in Kaggle competitions.
Why would one use the Wolfram Language versus R, Python, or Julia for machine learning?
Besides prettier plots and the Manipulate function, ...
11
votes
1
answer
1k
views
Neural Networks in Predict function
I'm trying to reproduce the result giving by a Predict function with a Neural Network as the chosen method.
So, I'm training from this set:
...
6
votes
0
answers
343
views
How to perform Bayesian optimization with Mathematica? [duplicate]
Does Mathematica have any Bayesian optimization methods for learning hyper-parameters?
Practical Bayesian Optimization of Machine Learning Algorithms
Jasper Snoek, Hugo Larochelle and Ryan P. ...
3
votes
0
answers
86
views
Undo automatic update [closed]
I was working with Predict function (with a neural network and today, and when I executed the same notebook I have been working for some time, Machine Learning package was automatically updated (it ...
7
votes
1
answer
635
views
Using ImageIdentify
How long does it take ImageIdentify to give an answer for one image? Also, I suppose using it requires an Internet connection with Wolfram servers. Is that correct?
3
votes
0
answers
153
views
How does Mathematica automatically choose which classifier method to use?
I'm interested in what heuristics are used in Classify's choice of method.
2
votes
4
answers
173
views
Pairs of data to Classify[]
Suppose I had the following data
a={1,2,3,4,5}
How would I turn this into
b={{1,2,3}->4,{2,3,4}->5}
That is, ...
3
votes
0
answers
78
views
Display of ConfusionMatrixPlot depends on Stylesheet [duplicate]
I´m using Classify and do the testing via ClassifierMeasurements. Now I observed that ConfusionMatrixPlot is not shown correctly when using StyleSheet Report(default). Maybe you can reproduce (example ...
0
votes
0
answers
114
views
Classify: other output representation
I'm working on a classisfy problem. The code is like:
CMDDrf = Classify[trainingdata, Method -> "RandomForest"]
Then I want to make a prediction based on a ...
2
votes
1
answer
716
views
How to implement the dual Lagrange?
I have seen in the Pang book of data mining the following example:
...
9
votes
0
answers
351
views
Exporting Classify Models
Currently I have created a simple classifier to classify sentiment from a string of text (or a tweet). The code is very basic and looks something like this:
...
11
votes
1
answer
581
views
8
votes
2
answers
2k
views
How to do $ n $-fold cross validation with Classify?
Other machine learning libraries have utilities to generate indices that can be used to generate dataset splits according to different cross-validation strategies. How do I tell ...
20
votes
1
answer
1k
views
Biased results when using Method -> "RandomForest" in Predict
I am interested in using random forests for some prediction, so I have been using Predict. I find that "RandomForest" method ...
3
votes
2
answers
159
views
Slow application of `Outer` on a matrix
I have some performance issue with the calculation of a gaussian kernel applied to a not-that-large dataset. I'm not very good with performance tuning in Mma and I have the feeling this one could be ...
3
votes
1
answer
456
views
Using a dataset of PredictorFunctions
I have been working with a dataset of predictor functions -- mainly so I can have more insight in to what the functions are doing and how they behave.
Where I am struggling is using ...
5
votes
1
answer
663
views
How can I train a binary classifier to find a logo?
So I'm trying to contruct a simple binary classifier.
Problem: Classify an image as containing the apple logo, or not.
I'd like it to be distortion, color, size and rotationally invariant. I'm sure ...
1
vote
0
answers
333
views
When using Classify[] on images, is preprocessing necessary?
If the images in the training data set have different sizes and channels and color spaces, will this hinder the classifier? The examples in the documentation seem to suggest that normalization with <...
24
votes
1
answer
6k
views
How can I detect if an image is of poor quality?
I need to filter out blurry or otherwise bad quality images from a set. I would like an efficient method to detect images that have any of the following three attributes:
Out of focus or motion blur
...
13
votes
2
answers
3k
views
How to train a convolutional neural net on images?
The functions Predict[] and Classify[] both have the option Method -> "NeuralNetwork", ...
15
votes
1
answer
472
views
Rapid density estimation and rendering of decision regions
I would like to create an interactive demonstration using Manipulate[] that illustrates a fundamental concept in pattern classification and machine learning. This ...
21
votes
2
answers
2k
views
How to know the internal algorithms of functions like Predict or Classify?
The document centre seems only explain how to use these functions, but just in an very brief way. I know Mathmatica is not open source, so we can not expect to see the code of the function, but are ...
11
votes
1
answer
402
views
How to view ClassifierFunction's preprocessed data?
Classify apparently preprocesses your input data, for example (same example from Classify reference page, but using ...
42
votes
1
answer
3k
views
How to perform document classification (i.e. extracting topics from text)?
I need to build a multi-label text classifier. There are a bunch of techniques for doing this, and it's called automatic document classification. I'm trying to use the EM technique (expectation ...