No bounding box showing while testing on custom data set

[mansi-aggarwal-2504]

Here are the steps I followed:

• downloaded the pretrained model resnet50_coco_best_v2.1.0.h5
• then I trained it on my dataset using keras_retinanet/bin/train.py csv /path/to/csv/file/containing/annotations /path/to/csv/file/containing/classes
• then I converted the last model saved in snapshots for inference using keras_retinanet/bin/convert_model.py snapshots/resnet50_csv_50.h5 /path/to/save/inference/model.h5

The thing is that I am not getting any bounding boxes on any image. Scores are an array of -1s and the boxes also have negative values. Did I have to mention something explicitly while training the resnet50_coco_best_v2.1.0.h5 on my dataset? `