### Bug description <!-- A clear and concise description of what the bug is. --> The evaluation of YoutubeDNNRetrieval model always returns metrics equal to 0. ### Steps/Code to reproduce bug - Use the notebook defined in this [PR](https://github.com/NVIDIA-Merlin/models/blob/youtube_dnn_retrieval/examples/%20Retrieval%20models%20(Movielens-1m)-%20Youtube-DNN%20retrieval%20model%20example.ipynb) but with the main branch
