[scikit-learn] Changes in the classifier

[aditya aggarwal]

I just want to change the log function while calculating entropy, how can I
do this in the scikit library?

On Thu, Jan 9, 2020 at 2:41 PM Adrin <adrin.jalali at gmail.com> wrote:

> Outside GIL, you can't really work easily with Python objects. You should
> instead stick to local C variables and routines. For instance, instead of
> numpy routines, you can use cmath routines.
>
> The cython book (
> https://www.amazon.com/Cython-Programmers-Kurt-W-Smith/dp/1491901551)
> and Nicolas's post (http://nicolas-hug.com/blog/cython_notes) may give
> you some hints.
>
> On Thu, Jan 9, 2020 at 7:24 AM aditya aggarwal <
> adityaselfefficient at gmail.com> wrote:
>
>> Hello
>>
>> I'm trying to change the entropy function which is used in sklearn for
>> DecisionTreeClassification locally on my system.
>> when I rerun the pip install --editable . command after updating the
>> cython file, I receive the following error message:
>>
>>  Error compiling Cython file:
>>     ------------------------------------------------------------
>>     ...
>>             for k in range(self.n_outputs):
>>                 for c in range(n_classes[k]):
>>                     count_k = sum_total[c]
>>                     if count_k > 0.0:
>>                         count_k /= self.weighted_n_node_samples
>>                         entropy -= count_k * np.log2(count_k)
>>                        ^
>>     ------------------------------------------------------------
>>
>>     sklearn/tree/_criterion.pyx:537:20: Coercion from Python not allowed
>> without the GIL
>>
>> This error is persisten with other errors as:
>>
>> Operation not allowed without gil
>> Converting to Python object not allowed without gil
>> Converting to Python object not allowed without gil
>> Calling gil-requiring function not allowed without gil
>> Accessing Python attribute not allowed without gil
>> Accessing Python global or builtin not allowed without gil
>>
>>
>> I've tried looking up for solution on various sites, but could not
>> resolve the issue.
>> Any help would be appreciated.
>>
>> Thanks and regards
>> Aditya Aggarwal
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>>
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