missing labelmap.json file

[bhargav-sudo]

Hi, Thanks for the project.
I am trying to track with object detector models provided in the https://github.com/tensorflow/models/blob/master/research/object_detection/g3doc/tf1_detection_zoo.md . But while i am running this it says it doesn't have labelmap.json file.

Where can I find labelmap.json file??

Although I created a json file like this.

{"label" : "person" , "index" : 0}

Ir returns the below error.

Traceback (most recent call last):
File "track.py", line 113, in
detections = detector.detect(frame)
File "/mvmed_tracker/detector.py", line 215, in detect
output_dict = self._get_output_dict(frame)
File "/mvmed_tracker/detector.py", line 329, in _get_output_dict
cls_labels.append(self._class_index_to_label(cls_idx))
File "/mvmed_tracker/detector.py", line 81, in _class_index_to_label
class_label = [map["label"] for map in self.label_map if map["index"] == class_index][0]
File "/mvmed_tracker/detector.py", line 81, in
class_label = [map["label"] for map in self.label_map if map["index"] == class_index][0]
TypeError: string indices must be integers

Thanks.

[LukasBommes]

Hey bhargav-sudo,

thanks for pointing this out.
I will take a look into why the labelmap is not contained in the repo.

As of now, please provide the labelmaps as list of dicts (instead of a dict). Ie., your labelmap.json should look as follows:

[{
	"label": "person",
	"index": 0
}]

[bhargav-sudo]

Hi @LukasBommes

Thanks for the quick response. I had created labelmap file as you said.
But it throws error like this.

Traceback (most recent call last):
File "track.py", line 113, in
detections = detector.detect(frame)
File "/mvmed_tracker/detector.py", line 216, in detect
output_dict = self._get_output_dict(frame)
File "/mvmed_tracker/detector.py", line 330, in _get_output_dict
cls_labels.append(self._class_index_to_label(cls_idx))
File "/mvmed_tracker/detector.py", line 82, in _class_index_to_label
class_label = [map["label"] for map in self.label_map if map["index"] == class_index][0]
IndexError: list index out of range

[LukasBommes]

Can you print which class_index leads to this error? Probably, there should be an additional class for the background. So, your labelmap should contain a person and a background class.

[bhargav-sudo]

Hi @LukasBommes I had solve the above issue by commenting in line 80. The bold last part in below line.

class_label = [map["label"] for map in self.label_map if map["index"] == class_index]#[0] This last part.

It works after that. But whenever I need to use more labels in json file. I need to uncomment it.
Thanks for the project. It really making interest to learn. 💯

But please check why the label map file isn't available in the repo.

[LukasBommes]

If you fix it like this, then you loose the ability to classify more than a single class as you have already pointed out.
Can you try the following labelmap?

[{
  "label": "background",
  "index": 0
},
{
   "label": "person",
   "index": 1
}]

It canbe that background and person have to be swapped.