All Questions
682 questions
1
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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 ...
- 1,582
2
votes
1
answer
695
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 ...
CommunityBot
- 1
1
vote
0
answers
610
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 ...
- 543
8
votes
0
answers
593
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 ...
- 1,417
7
votes
1
answer
702
views
How to ImageIdentify multiple objects in a single image?
Suppose an image has multiple objects:
ImageIdentify only finds the banana:
...
- 6,117
3
votes
0
answers
85
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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 ...
- 31.8k
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:
...
CommunityBot
- 1
4
votes
0
answers
439
views
How to make distance transform invariant to scale?
I am trying to use a distance transform as a descriptor to encode silhouettes in order to do a shape recognition task. It is clear that distance transform distribution is invariant under rotation and ...
- 4,341
12
votes
1
answer
462
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 <...
- 3,489
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 ...
CommunityBot
- 1
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. ...
- 31.8k
3
votes
0
answers
87
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 ...
- 273k
7
votes
1
answer
639
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?
- 73.4k
3
votes
0
answers
154
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, ...
- 401k
15
votes
1
answer
474
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 ...
CommunityBot
- 1
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 ...
- 2,855
2
votes
1
answer
738
views
How to implement the dual Lagrange?
I have seen in the Pang book of data mining the following example:
...
- 66.2k
11
votes
1
answer
581
views
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 ...
CommunityBot
- 1
3
votes
2
answers
161
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 ...
- 85.4k
5
votes
1
answer
670
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 ...
- 31.8k
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 <...
- 31.8k
10
votes
1
answer
735
views
Mathematica learning resource dealing with bayesian inference
Is there any good resource dealing with both Mathematica and bayesian inference?
- 1,913
7
votes
1
answer
901
views
Classify the classic tennis example
When using the classic tennis data (reference here) with Classify
...
CommunityBot
- 1
2
votes
0
answers
958
views
Max iterations in K-means clustering algorithm
I want to use k-means for clustering. I have used the ClusteringComponents function but I said how can I control the max-iteration for k-means ?
- 2,046
8
votes
1
answer
743
views
Using Predict on images
I have a dataset of some (grayscale) images (stored as a list in inputImages) varying in size and content (this is example data from Wolfram, so you can run the ...
- 42.8k
6
votes
1
answer
780
views
Sentiment analysis of tweets
I want to use Mathematica for a sentiment analysis on tweet-messages. For that purpose i selected several tweets. Each tweet is interpreted by myself as positive (pos) of negative (neg). For example:
...
- 36.8k
7
votes
2
answers
1k
views
Importing multiple images for machine learning classification
I want to create a ML classifier using images just like this example.
I have two classes of images in two different folders. Is there an easier way to import all images from both folders rather than ...
- 10.7k
7
votes
2
answers
142
views
ClassifierInformation's "ClassPriors" misreporting?
To the TLDR people
It seems to me that when you explicitly set ClassPriors when running Classify, it creates a ...
- 2,394
16
votes
1
answer
2k
views
Classify command in Mathematica 10
Where can I find documentation about the methods used in the Classify command in Mathematica 10? Specifically, how does the method ...
2
votes
3
answers
1k
views
Clustering data sets with multiple variables
I am learning how to cluster large datasets and this maybe a newbie question, but I haven’t found a suitable answer in the Documentation or on this board.
My question is best illustrated by an ...
- 1,867