So, I have been having this issue for a while. I thought it was was something I was doing wrong, but I have tried everything I could on my end. Everything runs fine on my desktop machine, but as soon as I put it on the Pi Zero it starts giving me errors:
pi@luxonis:~ $ python lpocr_test.py
/home/pi/depthai/depthai_sdk/src/depthai_sdk/oak_camera.py:274: UsbWarning: Device connected in USB2 mode! This might cause some issues. In such case, please try using a (different) USB3 cable, or force USB2 mode 'with OakCamera(usbSpeed='usb2') as oak:'
warnings.warn("Device connected in USB2 mode! This might cause some issues. "
[184430101176431300] [1.1.3] [4.642] [DetectionNetwork(4)] [warning] Network compiled for 7 shaves, maximum available 13, compiling for 6 shaves likely will yield in better performance
[184430101176431300] [1.1.3] [4.643] [DetectionNetwork(2)] [warning] Network compiled for 8 shaves, maximum available 13, compiling for 6 shaves likely will yield in better performance
[184430101176431300] [1.1.3] [4.660] [DetectionNetwork(4)] [warning] The issued warnings are orientative, based on optimal settings for a single network, if multiple networks are running in parallel the optimal settings may vary
[184430101176431300] [1.1.3] [4.660] [DetectionNetwork(2)] [warning] The issued warnings are orientative, based on optimal settings for a single network, if multiple networks are running in parallel the optimal settings may vary
aaaa
aaaa
[2023-05-25 05:00:42.360] [error] Callback with id: 1 throwed an exception: RuntimeError: dictionary changed size during iteration
At:
/home/pi/depthai/depthai_sdk/src/depthai_sdk/oak_outputs/xout/xout_nn.py(394): new_msg
/home/pi/depthai/depthai_sdk/src/depthai_sdk/oak_device.py(37): new_msg
/home/pi/depthai/depthai_sdk/src/depthai_sdk/oak_device.py(32): <lambda>
aaaa
^C[2023-05-25 05:00:47] INFO [root.__exit__:297] Closing OAK camera
[2023-05-25 05:00:56.783] [warning] Monitor thread (device: 184430101176431300 [1.1.3]) - ping was missed, closing the device connectionThe thing is that it still keeps working, but it seems to skip whatever detection was in the queue at that time. I figured it was some kind of race condition so I completely re-wrote the function to use oak.sync, then sync'd the TwoStagePacket and the DetectionPacket from det.main.out and rec.main.out and called them back at the same time, but that didn't help.
Anyway, I trimmed it down to the minimum code that (doesn't) works. Let me know what you need.
from depthai_sdk import OakCamera
from depthai_sdk.classes import TwoStagePacket
with OakCamera() as oak:
color = oak.create_camera('color', )
det = oak.create_nn(name='det', model='./models/exp24.json', input=color)
det.config_nn(resize_mode='crop')
rec = oak.create_nn(name='rec', model='./models/ocr.json', input=det)
def callback(packet: TwoStagePacket):
global last_text
text = ''
for char_dets in packet.nnData:
char_dets: packet.ImgDetections
det = char_dets.detections
print('aaaa')
oak.visualize(rec, callback=callback)
oak.start(blocking=True) (btw: can you let your discussion interface to uploade a json file?)
{
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"processor": "",
"python_build": "default Mar 12 2021 04:06:34",
"python_compiler": "GCC 10.2.1 20210110",
"python_implementation": "CPython",
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"release": "6.1.21+",
"system": "Linux",
"version": "#1642 Mon Apr 3 17:19:14 BST 2023",
"win32_ver": "",
"packages": [
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"-e git+https://github.com/luxonis/depthai.git@05cd55fc0158ec927a854e8ccf2be1fc80cedd3d#egg=depthai_sdk&subdirectory=depthai_sdk",
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"pyusb==1.2.1",
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"rainbowhat==0.1.0",
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"xmltodict==0.13.0",
"zstandard==0.18.0"
],
"usb": [
{
"port": 4,
"vendor_id": "0x0bda",
"product_id": "0x8152",
"speed": "High"
},
{
"port": 3,
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"product_id": "0x2485",
"speed": "High"
},
{
"port": 1,
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"product_id": "0xfa67",
"speed": "Full"
},
{
"port": 1,
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"product_id": "0x0101",
"speed": "High"
},
{
"port": 0,
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}
],
"uname": [
"Linux luxonis 6.1.21+ #1642 Mon Apr 3 17:19:14 BST 2023 armv6l"
]
}