[Python] OpenCV is failing to read ONNX file after Py made into EXE via Pyinstaller

I've read around and still do not know why this occurs. The below error occurs after attempting to use OpenCV for my application which detects a face in an image/live camera feed. I use pyinstaller's --onefile to put it into a single executable. Everything runs fine when it isn't an exe and I'm using python to run it.

Printing running directory parent
C:\Users\Shawn\AppData\Local\Temp\_MEI320842\mtcnn_cv2
[INFO ] [Base ] Leaving application in progress...
Traceback (most recent call last):
File "new_kiv.py", line 91, in <module>
File "kivy\app.py", line 950, in run
File "kivy\base.py", line 582, in runTouchApp
File "kivy\base.py", line 347, in mainloop
File "kivy\base.py", line 391, in idle
File "kivy\base.py", line 342, in dispatch_input
File "kivy\base.py", line 308, in post_dispatch_input
File "kivy\_event.pyx", line 709, in kivy._event.EventDispatcher.dispatch
File "kivy\uix\behaviors\button.py", line 179, in on_touch_up
File "kivy\_event.pyx", line 705, in kivy._event.EventDispatcher.dispatch
File "kivy\_event.pyx", line 1248, in kivy._event.EventObservers.dispatch
File "kivy\_event.pyx", line 1132, in kivy._event.EventObservers._dispatch
File "kivy\lang\builder.py", line 57, in custom_callback
File "C:\Users\Shawn\AppData\Local\Temp\_MEI320842\new_kiv.kv", line 234, in <module>
on_release: app.runInstant([InstantID.selectedAlgorithm, InstantID.selectedImage, InstantID.outputFolder])
File "new_kiv.py", line 27, in runInstant
File "modes\instant.py", line 40, in runInstant
File "algorithms\mtcnn.py", line 18, in getResult
File "mtcnn_cv2\mtcnn_opencv.py", line 56, in __init__
cv2.error: OpenCV(4.5.4) D:\a\opencv-python\opencv-python\opencv\modules\dnn\src\onnx\onnx_importer.cpp:198: error: (-5:Bad argument) Can't read ONNX file: C:\Users\Shawn\AppData\Local\Temp\_MEI320842\mtcnn_cv2\pnet.onnx in function 'cv::dnn::dnn4_v20211004::ONNXImporter::ONNXImporter'

[16232] Failed to execute script 'new_kiv' due to unhandled exception!


Code snippet

pnet_path = os.path.join(os.path.dirname(__file__), "pnet.onnx")
rnet_path = os.path.join(os.path.dirname(__file__), "rnet.onnx")
onet_path = os.path.join(os.path.dirname(__file__), "onet.onnx")
print("Printing running directory parent")
print(os.path.dirname(__file__))
self._pnet = cv2.dnn.readNetFromONNX(pnet_path) ## Errors HERE
self._rnet = cv2.dnn.readNetFromONNX(rnet_path)
self._onet = cv2.dnn.readNetFromONNX(onet_path)


My spec:

# -*- mode: python ; coding: utf-8 -*-

from kivy_deps import sdl2, glew
from kivymd import hooks_path as kivymd_hooks_path

block_cipher = None


a = Analysis(['new_kiv.py'],
pathex=['C:\\Users\\Shawn\\Documents\\GitHub\\FaceDetection\\virt\\Lib\\site-packages'],
binaries=[("C:\\Users\\Shawn\\Documents\\GitHub\\FaceDetection\\virt\\Lib\\site-packages\\cv2\\opencv_videoio_ffmpeg454_64.dll", ".")],
datas=[('libjpeg-9.dll', '.'),('libpng16-16.dll', '.'),('new_kiv.kv', '.'),('*.kv','.'),('opencv_videoio_ffmpeg454_64.dll', '.')],
hiddenimports=['win32timezone','plyer.platforms','plyer.platforms.win.notification', 'plyer.platforms.win.filechooser', 'onnx.onnx_cpp2py_export', 'onnx'],
hookspath=[kivymd_hooks_path],
hooksconfig={},
runtime_hooks=[],
excludes=[],
win_no_prefer_redirects=False,
win_private_assemblies=False,
cipher=block_cipher,
noarchive=False)
pyz = PYZ(a.pure, a.zipped_data,
cipher=block_cipher)

exe = EXE(pyz,
a.scripts,
a.binaries,
a.zipfiles,
a.datas,
[],
name='new_kiv',
debug=False,
bootloader_ignore_signals=False,
strip=False,
upx=True,
upx_exclude=[],
runtime_tmpdir=None,
console=True,
disable_windowed_traceback=False,
target_arch=None,
codesign_identity=None,
entitlements_file=None )

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