Question to sklearn modules

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Leo

posted Nov 7, 2016

Hey,

I've been playing around with sklearn.
While I am able to use some classes as the Decision Tree

from sklearn.tree import DecisionTreeRegressor (possible to import)

it's not possible to import other's eg. the neural network classifier:

from sklearn.neural_network import MLPClassifier

InputRejected:
Importing MLPClassifier from sklearn.neural_network raised an ImportError. No modules or attributes with a similar name were found.

Trying to copy the class's source code also failed because inheritance seems to be disabled in quantopian (InputRejected:
Insecure built-in function 'super').

I do understand that it comes from security concers as described in similar posts but i still have the follwing questions:

Am I doing anything wrong?
How can I see the limitations of actually supported libraries as sklearn?
Is there another possibility to use machine learning methods (classifiers/regressors) except sklearn that i could use instead?

Best Regards.

10 responses

D. Chris

Nov 7, 2016

Hi Leo,

It could be because of the scikit-learn version.
In order to use the "MLPClassifier", you need the scikit-learn version 0.18.

Chris

Leo

Nov 7, 2016

Hi Chris,

It looks like Quantopian currently provides version 0.18. That should be correct.

I actually was successful in importing the "MLPClassifier" but with a different syntax (See notebook).
So to me it looks like an understanding problem of python but i still dont know why it works with the DecisionTreeClassifier.

Can you shortly explain why

import sklearn.neural_network  
ANN = sklearn.neural_network.MLPClassifier(solver='lbfgs', alpha=1e-5,hidden_layer_sizes=(5, 2), random_state=1)

works
but

from sklearn.neural_network import MLPClassifier  
clf = MLPClassifier(solver='lbfgs', alpha=1e-5,hidden_layer_sizes=(5, 2), random_state=1)

does not work although it works with the Class "DecisionTreeClassifier" of sklearn.tree both ways?

Regards

D. Chris

Nov 7, 2016

You are right Leo, it's not a version issue here.
It must be an issue from Quantopian side because it works well on Jupyter Notebook with the same verison.

I am sorry but I could not help you more here, but maybe someone from Quantopian could help.

Regards,
Chris

Leo

Nov 7, 2016

Hey Chris,

thanks.

Yes I would appriciate if Quantopian Support or anyone with similar problems could help here.
I also have these problems with other classes from sklearn.

Regards

Konsta Tiihonen

Feb 27, 2017

Hi!
trying

import sklearn.neural_network  
ANN = sklearn.neural_network.MLPClassifier(solver='lbfgs', alpha=1e-5,hidden_layer_sizes=(5, 2), random_state=1)

yields

SecurityViolation: 0002 Security Violation(s): Insecure attribute access "sklearn.neural_network.MLPClassifier" on line 2

for me. This is from a research notebook. Do you get the same?

arshpreet singh

Mar 8, 2017

@Konsta Tiihonen, Yes I am getting the same error

Kenneth Potts

Jul 19, 2017

There is a similar issue with sklearn.kernel_ridge. I could be wrong but I though this was included in the version of sklearn that Quantopian provides. In this case, at least implementing kernel ridge regression is a 2 liner in Python with Numpy, the same isn't true for MLPClassifier :(