Hey! So for some time now, i've been working on using the Oak-D Lite camera, and i've successfully managed to incorporate a YoloV5 model. The issue is that the original model that i've made is of size 416x416 and the image returned is a bit small. For some time now i've been trying to re-train the model using the notebook you provided, with slightly larger image size but for some reason it simply does not work. The pipeline starts regularly, and the preview image is indeed larger but the following error keeps occuring in the console: [1844301041DDC21200] [344.188] [SpatialDetectionNetwork(1)] [error] Mask is not defined for output layer with width '80'. Define at pipeline build time using: 'setAnchorMasks' for 'side80'. [1844301041DDC21200] [344.188] [SpatialDetectionNetwork(1)] [error] Mask is not defined for output layer with width '40'. Define at pipeline build time using: 'setAnchorMasks' for 'side40'. [1844301041DDC21200] [344.188] [SpatialDetectionNetwork(1)] [error] Mask is not defined for output layer with width '20'. Define at pipeline build time using: 'setAnchorMasks' for 'side20'. The anchors and anchor masks in the cfg json are as following : "anchors": [ 10, 13, 16, 30, 33, 23, 30, 61, 62, 45, 59, 119, 116, 90, 156, 198, 373, 326 ], "anchor_masks": { "side52": [0, 1, 2], "side26": [3, 4, 5], "side13": [6, 7, 8] }, What could be the issue here? Any help is appriciated!

Hello medonni , I believe you need to copy anchors/masks from the generated json (or just use that json) when following the yolov5 training notebook . Have you taken that step? Thanks, Erik

erik Hey Erik! Which json are you exactly referring to? The only mentions of json in the notebook are save_json=False in the validation step, and in the on-device decoding where its explained that we should only just change num of classes and labels. What am i missing here? Thanks in advance!

Hello medonni , I have reread your initial post and I am not sure, have you changed the default resolution (416x416)? If you haven't, the JSON at the depthai-experiments should work as expected. Thanks, Erik

erik Hey! Yea, i'm trying to change the model to a bigger size, currently trying a 640x640. The first model i trained was at 416x416 and it worked fine with the provided JSON. The issue is that from what i realized, the model size is directly tied to the size of preview window and it being at 416x416 is just a tad bit small, therefore i want to up the size a little bit.

Changing model size when training returns output layer width error

medonni

Resolved thanks to Conor on discord.

Issue was that anchor masks change based on the actual model size, so for 640x640 i needed 80/40/20 masks in the config. To calculate it we should do size/32, size/16, size/8, and use the obtained anchor masks.

stephansturges

medonni

Please can you share what your final JSON file looked like? I can't figure this out...

medonni

stephansturges

Hey!

sorry for the late reply.

Here is the JSON as of today.

{ "nn_config": { "output_format": "detection", "NN_family": "YOLO", "input_size" : "416x416", "NN_specific_metadata": { "classes": 1, "coordinates": 4, "anchors": [ 10, 13, 16, 30, 33, 23, 30, 61, 62, 45, 59, 119, 116, 90, 156, 198, 373, 326 ], "anchor_masks" : { "side52": [0, 1, 2], "side26": [3, 4, 5], "side13": [6, 7, 8] }, "iou_threshold": 0.5, "confidence_threshold": 0.65 } }, "mappings": { "labels": ["plate"] } }

Hope this helps!

StavanRupareliya

Hello medonni stephansturges
I have tried suggested solution it's not working for me.
Can you send me working JSON file for custom yolov5 model ...
ERROR - [DetectionNetwork(1)] [error] Mask is not defined for output layer with width '6'. Define at pipeline build time using: 'setAnchorMasks' for 'side6'

stephansturges

Thanks!

medonni

StavanRupareliya Unfortunately not, as i do not have the access to it anymore.

What is the model size you are trying to do?

StavanRupareliya

640 X 640

NKG

medonni
Hey I'm using a pretrained model model_name = "yolov5n_coco_416x416", zoo_type = "depthai" and I continuosly get this error [SpatialDetectionNetwork(1)] [error] Mask is not defined for output layer with width '52'. Define at pipeline build time using: 'setAnchorMasks' for 'side52'.
The pretrained network works fine for my use case so I was not training it and I'm not sure how to resolve the above error?

krishnashravan

Hey
i used a custom gesture detection from https://pyimagesearch.com/2023/05/01/training-the-yolov8-object-detector-for-oak-d/
after converting the pt to blob using the tool
{

"model": {

"xml": "yolov8ntrained.xml",

"bin": "yolov8ntrained.bin"

"nn_config": {

"output_format": "detection",

"NN_family": "YOLO",

"input_size": "416x416",

"NN_specific_metadata": {

"classes": 5,

"coordinates": 4,

"anchors": [],

"anchor_masks": {},

"iou_threshold": 0.5,

"confidence_threshold": 0.5

}

"mappings": {

"labels": [

"Class_0",

"Class_1",

"Class_2",

"Class_3",

"Class_4"

]

"version": 1

}
[DetectionNetwork(1)] [error] Mask is not defined for output layer with width '52'. Define at pipeline build time using: 'setAnchorMasks' for 'side52'.
this is the error i get
is this a issue i changed the default input size to 416x416 instead of 640x640

There is no anchormasks for the json file i provided
can u tell me what i did wrong?

erik

krishnashravan you need to define masks/anchors, you currently have this empty:

"anchors": [],
"anchor_masks": {},

If you have .pt model, you can use tools.luxonis.com, which will return the json together with the anchors/masks.

krishnashravan

I used the tools to get the blob file along with the json file thats the json file from the luxonis tool

erik

krishnashravan could you provide .pt?

ThasnimolVSam22d007

erik in luxonics there is no option to provide .pt in https://blobconverter.luxonis.com/ - in this tool

krishnashravan

the pt files
the hand gesture that is nano and small model trained with 416 input size (handntrained and handstrained)
the person detection that is nano trained with 640 input size (personntrained)

erik

krishnashravan Have you also posted the question on their webpage?

krishnashravan

erik

No not yet

Just now i tried with the yolov8 training colab file from the repo i'm getting the same empty anchor values

krishnashravan

erik
these are the pt files trained with the YoloV8_training.ipynb notebook

Timmm

I have also trained YOLOv8, I think it YOLOv8 doesnot use anchor boxes instead uses Dynamic Convolutional layers. krishnashravan. Make sure you double check to use handntrained and handstrained model with 416x416 input image size.

\';LKMJNH BVCXP

Timmm

detectionNetwork.setAnchors( [10.0, 13.0, 16.0, 30.0, 33.0, 23.0, 30.0, 61.0, 62.0, 45.0, 59.0, 119.0, 116.0, 90.0, 156.0, 198.0, 373.0,326.0])

detectionNetwork.setAnchorMasks({"side52": [0, 1, 2], "side26": [3, 4, 5], "side13": [6, 7, 8]})

@krishnashravan Try setting your anchors and anchormasks as above.

ThasnimolVSam22d007

erik

how to change this default resolutuon?

and get this json file?

erik

Hi ThasnimolVSam22d007 ,
Size of the model has to be set/configured before using blobconverter.