How to fix the order of id and name in YOLO format

[youyuge34]

When export the same tags of object detection in YOLO format, the tag order of two datasets are different:

{
  "categories": [
    {
      "id": 0,
      "name": "list_describe"
    },
    {
      "id": 1,
      "name": "discount"
    },
    {
      "id": 2,
      "name": "member"
    },
    {
      "id": 3,
      "name": "card_price"
    },
    {
      "id": 4,
      "name": "card_name"
    },
    {
      "id": 5,
      "name": "card_img"
    },
    {
      "id": 6,
      "name": "card"
    }
  ],
  "info": {
    "year": 2022,
    "version": "1.0",
    "contributor": "Label Studio"
  }
}

{
  "categories": [
    {
      "id": 0,
      "name": "card_img"
    },
    {
      "id": 1,
      "name": "card_name"
    },
    {
      "id": 2,
      "name": "card_price"
    },
    {
      "id": 3,
      "name": "card"
    },
    {
      "id": 4,
      "name": "member"
    },
    {
      "id": 5,
      "name": "discount"
    },
    {
      "id": 6,
      "name": "list_describe"
    }
  ],
  "info": {
    "year": 2022,
    "version": "1.0",
    "contributor": "Label Studio"
  }
}

What is the logic of the name order and how to fix the order between two Projects？

[youyuge34]

Why they are not in alphabetical order？

[KonstantinKorotaev]

@youyuge34 Hi, could you please share your label config?

[youyuge34]

@KonstantinKorotaev

<View>
  <View style="display:flex;align-items:start;gap:8px;flex-direction:column-reverse">
    <Image name="image" value="$url" zoom="true" zoomControl="true" width="400px"/>
    <RectangleLabels name="label" toName="image" showInline="true">
      <Label value="card" background="#FFA39E"/>
      <Label value="card_img" background="#0d25d3"/>
      <Label value="card_name" background="#FFC069"/>
      <Label value="card_price" background="#03ad00"/>
      <Label value="member" background="#ec0f04"/>
      <Label value="discount" background="#f0cc19"/>
      <Label value="list_describe" background="#da1fff"/>
    </RectangleLabels>
  </View>
</View>

[KonstantinKorotaev]

@youyuge34 Could you please also share your version of label-studio-converter?

[youyuge34]

@KonstantinKorotaev I use label-studio v1.4 and label-studio-converter 0.0.36

[KonstantinKorotaev]

label-studio-converter 0.0.36

Could you please update it to 0.0.40 and check one more time?

[shafeeq07]

Hi, I'm facing the same issue. I think it is because set() is used to filter duplicate elements in labels list, but set() does not maintain order of the elements so it changes the tag order.

here is the line reference https://github.com/heartexlabs/label-studio-converter/blob/7918410c420d6ffe00991409db96798b6a610293/label_studio_converter/converter.py#L911

[KonstantinKorotaev]

Hi @shafeeq07 Could you please share your label config?

[TrueWodzu]

Hi, I have the same problem. Latest label studio version used. After exporting my project to YOLOv5 the class order is like this:

head person

but I want to have it defined like this: person head

it is important for transfer learning where ID of classes are already defined. I think the best solution would be to add an tag or or whatever name you chose to labelling interface.

[makseq]

Try adding category to labels <Label category="123">, e.g.:

<View>
  <View style="display:flex;align-items:start;gap:8px;flex-direction:column-reverse">
    <Image name="image" value="$url" zoom="true" zoomControl="true" width="400px"/>
    <RectangleLabels name="label" toName="image" showInline="true">
      <Label value="card" background="#FFA39E" category="1"/>
      <Label value="card_img" background="#0d25d3" category="2"/>
      <Label value="card_name" background="#FFC069" category="3"/>
      <Label value="card_price" background="#03ad00" category="4"/>
      <Label value="member" background="#ec0f04" category="5"/>
      <Label value="discount" background="#f0cc19" category="6"/>
      <Label value="list_describe" background="#da1fff" category="7"/>
    </RectangleLabels>
  </View>
</View>

How it works: https://github.com/heartexlabs/label-studio-converter/pull/50/files#diff-322ce95b5aa5f02fb330c7f62be1ea0066c01829b564db0644872e09338a3ddfR745