Can't train my custom model

Hi,

I need to train an image recognition with a custom dataset. I found this tutorial online : https://tensorflow-object-detection-api-tutorial.readthedocs.io/en/latest/training.html

I followed carefully all the step and when I launched my training a weird thing happened. It look like the training began but on every image it did not do things even if it takes like 1 minute before adding a new line on the prompt.

"INFO:tensorflow:Starting Session.
I1205 11:38:48.920712 139894946572096 learning.py:754] Starting Session.
INFO:tensorflow:Saving checkpoint to path training/model.ckpt
I1205 11:38:49.326428 139893023946496 supervisor.py:1117] Saving checkpoint to path training/model.ckpt
INFO:tensorflow:Starting Queues.
I1205 11:38:49.371733 139894946572096 learning.py:768] Starting Queues.
INFO:tensorflow:global_step/sec: 0
I1205 11:38:56.664494 139893015553792 supervisor.py:1099] global_step/sec: 0
INFO:tensorflow:global_step/sec: 0
I1205 11:40:51.604840 139893015553792 supervisor.py:1099] global_step/sec: 0
INFO:tensorflow:global_step/sec: 0
I1205 11:42:51.600481 139893015553792 supervisor.py:1099] global_step/sec: 0
INFO:tensorflow:global_step/sec: 0
I1205 11:44:51.600608 139893015553792 supervisor.py:1099] global_step/sec: 0
INFO:tensorflow:global_step/sec: 0
I1205 11:46:51.600104 139893015553792 supervisor.py:1099] global_step/sec: 0
INFO:tensorflow:Saving checkpoint to path training/model.ckpt
I1205 11:48:49.324800 139893023946496 supervisor.py:1117] Saving checkpoint to path training/model.ckpt
INFO:tensorflow:global_step/sec: 0
I1205 11:48:51.599744 139893015553792 supervisor.py:1099] global_step/sec: 0"

Also, when I launch the training I got a lot of warning at the beginning I don't know if it's a part of the problem.

Thank you for your help.