svm | Support Vector Machines in Python | Machine Learning library
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Trending Discussions on svm
QUESTION
General terms that I used to search on google such as Localised Accuracy, custom accuracy, biased cost functions all seem wrong, and maybe I am not even asking the right questions.
Imagine I have some data, may it be the:
- The famous Iris Classification Problem
- Pictures of felines
- The Following Dataset that I made up on predicting house prices:
In all these scenario, I am really interested in the accuracy of one set/one regression range of data.
For irises, I really need Iris "setosa" to be classified correctly, really don't care if Iris virginica and Iris versicolor are all wrong.
for Felines, I really need the model to tell me if you spotted a tiger (for obvious reason), whether it is a Persian or ragdoll or not I dont really care.
For the house prices one, i want the accuracy of higher-end houses error to be minimised. Because error in those is costly.
How do I do this? If I want Setosa to be classified correctly, removing virginica or versicolour both seem wrong. Trying different algorithm like Linear/SVM etc are all well and good, but it only improves the OVERALL accuracy. But I really need, for example, "Tigers" to be predicted correctly, even at the expense of the "overall" accuracy of the model.
Is there a way to have a custom cost-function to allow me to have a high accuracy in a localise region in a regression problem, or a specific category in a classification problem?
If this cannot be answered, if you could just point me to some terms that i can search/research that would still be greatly appreciated.
...ANSWER
Answered 2022-Mar-08 at 14:53You can use weights to achieve that. If you're using the SVC class of scikit-learn, you can pass class_weight
in the constructor. You could also pass sample_weight
in the fit-method.
For example:
QUESTION
I have created a class for word2vec vectorisation which is working fine. But when I create a model pickle file and use that pickle file in a Flask App, I am getting an error like:
AttributeError: module
'__main__'
has no attribute 'GensimWord2VecVectorizer'
I am creating the model on Google Colab.
Code in Jupyter Notebook:
...ANSWER
Answered 2022-Feb-24 at 11:48Import GensimWord2VecVectorizer
in your Flask Web app python file.
QUESTION
I have 3 columns namely Models(should be taken as index), Accuracy without normalization, Accuracy with normalization (zscore, minmax, maxabs, robust) and these are required to be created as:
...ANSWER
Answered 2022-Feb-20 at 13:01There's a dirty way to do this, I'll write about it till someone answers with a better idea. Here we go:
QUESTION
I would like to get this:
Currently, the button is not aligned like the horizontal bar.
I would like to placed this button correctly and avoid spacing.
I'm interested, if you have a solution in bootstrap 4 or bootstrap 5.
Thanks a lot for your help
...ANSWER
Answered 2022-Feb-15 at 20:22This does not necessarily have to do with Bootstrap.
You are implying width: 97%
to .separator-breadcrumb
, so it does not use all the available space.
In order to fix it, replace line:
QUESTION
I have a dataset that contains information about patients. It includes several variables and their clinical status (0 if they are healthy, 1 if they are sick). I have tried to implement an SVM model to predict patient status based on these variables.
...ANSWER
Answered 2022-Feb-13 at 03:32Did you look at the probabilities versus the fitted values? You can read about how probability works with SVM here.
If you want to look at the performance you can use the library DescTools
and the function Conf
or with the library caret
and the function confusionMatrix
. (They provide the same output.)
QUESTION
I'm getting this error:
...ANSWER
Answered 2022-Feb-06 at 12:57Please, consider trying to follow the instruction from quarkus/faq.adoc at main · quarkusio/quarkus:
1. Native compilationNative executable fails on macOS with
error: unknown type name 'uint8_t'
Your macOS has the wrong
*.h
files compared to the OS and no gcc compilation will work. This can happen when you migrate from versions of the OS. See Cannot compile any C++ programs; error: unknown type name 'uint8_t'The solution is to
sudo mv /usr/local/include /usr/local/include.old
- Reinstall XCode for good measure
- (optional?)
brew install llvm
- generally reinstall your brew dependencies with native compilation
The executable should work now.
The purpose of (the idea behind) renaming the include
directory (from include
to include.old
) seems to be explained in the answer.
- Related question. May contain some possible solutions. Broken c++ std libraries on macOS High Sierra 10.13 - Stack Overflow.
QUESTION
I have a huge dataframe that I want to run a multi class svm model on but I am confused on how to format the dataframe to do so. This is what the dataframe looks like:
x y class x1 y1 1 x2 y2 2 x3 y3 3 x4 y4 4 etc etc etcHow do I actually run the data on an svm model? thanks
...ANSWER
Answered 2022-Feb-03 at 18:49Simply do this
QUESTION
I want to apply a partial tucker decomposition algorithm to minimize MNIST image tensor dataset of (60000,28,28), in order to conserve its features when applying another machine algorithm afterwards like SVM. I have this code that minimizes the second and third dimension of the tensor
...ANSWER
Answered 2021-Dec-28 at 21:05So if you look at the source code for tensorly
linked here you can see that the documentation for the function in question partial_tucker
says:
QUESTION
I'm trying to build Quarkus Native app but I'm getting access denied during process build inside Docker. I'm following this doc
Dockerfile:
...ANSWER
Answered 2021-Dec-27 at 16:49The issue was caused by WORKDIR clause before copy instruction.
Fixed Dockerfile:
QUESTION
I am trying to apply the idea of sklearn
ROC extension to multiclass to my dataset. My per-class ROC curve looks find of a straight line each, unline the sklearn
's example showing curve's fluctuating.
I give an MWE below to show what I mean:
...ANSWER
Answered 2021-Dec-08 at 18:12Point is that you're using
predict()
rather thanpredict_proba()
/decision_function()
to define youry_hat
. This means - considering that the threshold vector is defined by the number of distinct values iny_hat
(see here for reference), that you'll have few thresholds per class only on whichtpr
andfpr
are computed (which in turn implies that your curves are evaluated at few points only).Indeed, consider what the doc says to pass to
y_scores
inroc_curve()
, either prob estimates or decision values. In the example fromsklearn
, decision values are used to compute the scores. Given that you're considering aRandomForestClassifier()
, considering probability estimates in youry_hat
should be the way to go.What's the point then of label-binarizing the output? The standard definition for ROC is in terms of binary classification. To pass to a multiclass problem, you have to convert your problem into binary by using OneVsAll approach, so that you'll have
n_class
number of ROC curves. (Observe, indeed, that asSVC()
handles multiclass problems in a OvO fashion by default, in the example they had to force to use OvA by applyingOneVsRestClassifier
constructor; with aRandomForestClassifier
you don't have such problem as that's inherently multiclass, see here for reference). In these terms, once you switch topredict_proba()
you'll see there's no much sense in label binarizing predictions.
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You can use svm like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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