This is the official PyTorch implementation of Drop-DTW [1] (published at NeurIPS'21). The code includes the core Drop-DTW algorithm as well as the step localization experiments on the COIN dataset [2].

1. (a) Download pre-extracted features for the COIN dataset by running download_coin_features.sh in the root folder of the project. The features are extracted using the S3D net pretrained on HowTo100M [3]; OR (b) If for some reason you do not want to use pre-extracted features but instead you want to extract the features yourself, please follow the instructions in video_encoding/. This step is performed instead of step 1a.
2. In the terminal where you are going to run training/testing, run the following command first:

   ulimit -n 5000
   

   This sets the number of simultaneously open files to 5000 which is important to make the data loader function properly.

In order to train a feature mapping with Drop-DTW loss (using 0.3 percentile drop-cost) run the following command:

python3 train.py --name=my_model --keep_percentile=0.3

Inspect train.py for possible additional training configurations, such network architecture changes, learnable drop cost and many more.

To test your model's ability to do step localization on the CONI dataset, run the following code:

python3 evaluate.py --name=my_model

You can change the inference method from Drop-DTW to some other algorithms and alter other testing settings using flags. Please, refer to evaluate.py for more details.

[1] Dvornik et al. "Drop-DTW: Aligning Common Signal Between Sequences While Dropping Outliers." NeurIPS'21. [2] Tang et al. "COIN: A Large-scale Dataset for Comprehensive Instructional Video Analysis." CVPR'19 [3] - Miech et al. "End-to-end learning of visual representations from uncurated instructional videos." CVPR'20.