In jitclass, will not compile when a member variable is used in numpy.zeros()

[ghost]

outputs = np.zeros((len(inputs), self.output_shape), dtype=float64)

does not work, but

i = self.output_shape
outputs = np.zeros((len(inputs), i), dtype=float64)

does.

[stuartarchibald]

Thanks for the report. Slightly modifying the Bag example from here: https://github.com/numba/numba/blob/master/examples/jitclass.py

I cannot seem to reproduce:

import numpy as np
from numba import jitclass          # import the decorator
from numba import int32, float32    # import the types

spec = [
    ('value', int32),               # a simple scalar field
    ('array', float32[:]),          # an array field
]


@jitclass(spec)
class Bag(object):
    def __init__(self, value):
        self.value = value
        self.array = np.zeros(value, dtype=np.float32)
        outputs = np.zeros((10, self.value), dtype=np.float64)

    @property
    def size(self):
        return self.array.size

    def increment(self, val):
        for i in range(self.size):
            self.array[i] += val
        outputs = np.zeros((10, self.value), dtype=np.float64)
        return self.array, outputs


mybag = Bag(21)
print('isinstance(mybag, Bag)', isinstance(mybag, Bag))
print('mybag.value', mybag.value)
print('mybag.array', mybag.array)
print('mybag.size', mybag.size)
print('mybag.increment(3)', mybag.increment(3))
print('mybag.increment(6)', mybag.increment(6))

Please could you provide more information about what caused this problem:

1. The code that you were running (as a minimal working reproducer, if you are unsure how to write one see http://matthewrocklin.com/blog/work/2018/02/28/minimal-bug-reports).
2. Any data needed to run the code.
3. The full trace back of the exception.

Once we have a reproducer someone can take a look and work on a fix. Thanks for your help.

[ghost]

Strangely enough, I'm not able to reproduce the error either. I continued working on my project with my work around because it was time-sensitive. I just came back to this issue and removed the work around and it compiles just fine.

[stuartarchibald]

Thanks for reporting back. Closing this issue as it seems to be resolved. If this is not the case please re-open with a comment about any item that appears to be unresolved. Many thanks.

[capocci-d]

Dear all, unfortunately I have the same problem i.e. I get an error when I declare a zero-matrix inside a jitclass. Was this issue solved?

[gmarkall]

@capocci-d It looks like it - if you're having an issue could you please post details of the code you're struggling with on https://numba.discourse.group ?