python setup.py build_ext --inplace

[leeshinbi]

Compiling darkflow/cython_utils/nms.pyx because it changed.
Compiling darkflow/cython_utils/cy_yolo2_findboxes.pyx because it changed.
Compiling darkflow/cython_utils/cy_yolo_findboxes.pyx because it changed.
[1/3] Cythonizing darkflow/cython_utils/cy_yolo2_findboxes.pyx
C:\Users\82103.conda\envs\DarkflowTest\lib\site-packages\Cython\Compiler\Main.py:384: FutureWarning: Cython directive 'language_level' not set, using '3str' for now (Py3). This has changed from earlier releases! File: C:\Users\82103.conda\envs\DarkflowTest\darkflow\darkflow\cython_utils\cy_yolo2_findboxes.pyx
tree = Parsing.p_module(s, pxd, full_module_name)

Error compiling Cython file:

...
cimport numpy as np
cimport cython
ctypedef np.float_t DTYPE_t
from libc.math cimport exp
from ..utils.box import BoundBox
from nms cimport NMS
^

darkflow\cython_utils\cy_yolo2_findboxes.pyx:7:0: 'nms.pxd' not found

Error compiling Cython file:

...
cimport numpy as np
cimport cython
ctypedef np.float_t DTYPE_t
from libc.math cimport exp
from ..utils.box import BoundBox
from nms cimport NMS
^

darkflow\cython_utils\cy_yolo2_findboxes.pyx:7:0: 'nms\NMS.pxd' not found

Error compiling Cython file:

...
if(tempc > threshold):
probs[row, col, box_loop, class_loop] = tempc

#NMS
return NMS(np.ascontiguousarray(probs).reshape(H*W*B,C), np.ascontiguousarray(Bbox_pred).reshape(H*B*W,5))
       ^

---

darkflow\cython_utils\cy_yolo2_findboxes.pyx:97:11: 'NMS' is not a constant, variable or function identifier
Traceback (most recent call last):
File "setup.py", line 73, in
ext_modules = cythonize(ext_modules)
File "C:\Users\82103.conda\envs\DarkflowTest\lib\site-packages\Cython\Build\Dependencies.py", line 1134, in cythonize
cythonize_one(*args)
File "C:\Users\82103.conda\envs\DarkflowTest\lib\site-packages\Cython\Build\Dependencies.py", line 1301, in cythonize_one
raise CompileError(None, pyx_file)
Cython.Compiler.Errors.CompileError: darkflow/cython_utils/cy_yolo2_findboxes.pyx

[ferozkhanabbasi]

Same issue

[akbaig]

Please refer to #1221

[prsntmaurya]

Copying the files "nms.pxd" & "nms.pyx" to directory where setup.py is located, worked for me on python 3.6