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cdef-ing a memory view or array with a custom numpy dtype #2760

NicolasHug opened this Issue Dec 16, 2018 · 0 comments


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NicolasHug commented Dec 16, 2018

I am trying to declare an array or a memory-view with a custom dtype, but I'm getting compilation errors:

cimport cython

import numpy as np
cimport numpy as np

MY_DTYPE = np.dtype([
    ('field_a', np.float32),
    ('field_b', np.float32),

def f():
    cdef MY_DTYPE.type [:] array


Error compiling Cython file:
    ('field_b', np.float32),

def f():
    cdef MY_DTYPE.type [:] array

sklearn/ensemble/blop.pyx:13:9: 'MY_DTYPE' is not a cimported module

Using cdef MY_DTYPE [:] array also fails with 'MY_DTYPE' is not a type identifier.

I've checked the docs, passed issues and the mailing list but could not find any example that didn't use numpy's built-in dtypes. This might be related to #2022?

Any help would be greatly appreciated!

@NicolasHug NicolasHug referenced a pull request that will close this issue Jan 23, 2019


[DOC] Add doc for memory views with custom numpy dtype #2813

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