Numba：在jitted函數中訪問類屬性

-1

import numba 
import numpy as np 

class MyClass(object): 
    def __init__(self): 
     self.Value=0.0 
     self.Array=np.array([],dtype=np.float64) 

@numba.jit(nopython=True) 
def Fun(ClassInstance): 
    print ClassInstance.Array*1.0

當我執行這些簡單的線條

A=MyClass() 
Fun(A)

我得到以下錯誤：

numba/dataflow.py:346: RuntimeWarning: Python2 style print partially supported. Please use Python3 style print. 
    "Python3 style print.", RuntimeWarning) 
Traceback (most recent call last): 
    File "<stdin>", line 1, in <module> 
    File "numba/dispatcher.py", line 310, in _compile_for_args 
    raise e 
numba.errors.UntypedAttributeError: Caused By: 
Traceback (most recent call last): 
    File "numba/compiler.py", line 230, in run 
    stage() 
    File "numba/compiler.py", line 444, in stage_nopython_frontend 
    self.locals) 
    File "numba/compiler.py", line 800, in type_inference_stage 
    infer.propagate() 
    File "numba/typeinfer.py", line 767, in propagate 
    raise errors[0] 
UntypedAttributeError: Unknown attribute 'Array' of type pyobject 
File "bumba.py", line 11 
[1] During: typing of get attribute at bumba.py (11) 

Failed at nopython (nopython frontend) 
Unknown attribute 'Array' of type pyobject 
File "bumba.py", line 11 
[1] During: typing of get attribute at bumba.py (11) 

This error may have been caused by the following argument(s): 
- argument 0: cannot determine Numba type of <class '__main__.MyClass'>

它會把我爲什麼numba無法識別陣列。既然它是如此基本的功能，我必須假設我錯過了一些至關重要的東西，但我至今沒有找到任何解決方案。

來源

2017-06-20 Deathbreath

您禁止它使用'nopython = True'訪問任何Python API，然後通過'ClassInstance.Array'告訴它訪問Python API。 – user2357112

如果你想訪問任意的Python對象屬性，你需要關閉nopython。 – user2357112

所以請幫我找到我的想法中的錯誤。根據Numba的描述，'nopython'僅僅禁止Python的C API。我不知道訪問屬性構成訪問C API。 – Deathbreath

正如@ user2537112表示的意見，Numba的nopython選項jit導致通過PyObject_GetAttr Python的C API的調用，因爲Numba目前不支持屬性訪問。解決方法包括將對象屬性直接傳遞給函數，而不是通過對象實例。

來源

2017-06-22 13:00:20 Deathbreath

Numba：在jitted函數中訪問類屬性

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