This section assumes you have successfully installed zamba and want to get right to making species predictions for some videos! All of the commands here should be run at the commandline. On macOS, this can be done in the terminal (⌘+space, “Terminal”). On Windows, this can be done in a command prompt, and if you installed Anaconda an anaconda prompt (Start > Anaconda3 > Anaconda Prompt).

Input videos

For example, we might have the directory vids_to_classify with camera trap videos in it:

$ ls vids_to_classify/

Here are some screenshots from those videos:

elephant ungulate
blank cat

In this example, the videos have meaningful names so that we can easily compare the predictions made by zamba. In practice, your videos will probably be named something much less useful!

Predict Using Concise Output Format

If you just want to know the most likely animal in each video, the --output_class_names flag is useful. In this case, the final output as well as the resulting output.csv are simplified to show the most probable animal in each video:

$ zamba predict vids_to_classify/ --output_class_names
blank2.mp4                blank
eleph.mp4              elephant
blank1.mp4                blank
ungulate.mp4     large ungulate
small-cat.mp4         small cat

NOTE: zamba needs to download the “weights” files for the neural networks that it uses to make predictions. On first run it will download ~1GB of files with these weights. Once these are downloaded, the tool will use the local versions and will not need to perform this download again. If you are not in the US, we recommend running the above command with the additional flag either --weight_download_region eu or --weight_download_region asia depending on your location. The closer you are to the server the faster the downloads will be.

Getting Help from the Command Line

Once zamba is installed, you can see the available commands with zamba:

$ zamba

Usage: zamba [OPTIONS] COMMAND [ARGS]...

  --help  Show this message and exit.

  predict  Identify species in a video.
  train    [NOT IMPLEMENTED] Retrain network from...
  tune     [NOT IMPLEMENTED] Update network with new...

To see more detailed information about a command as well as the options available to pass to it, use the --help flag. For example, get more information about the predict command and its options:

$ zamba predict --help
Usage: zamba predict [OPTIONS] [DATA_PATH] [PRED_PATH]

  Identify species in a video.

  This is a command line interface for prediction on camera trap footage.
  Given a path to camera trap footage, the predict function use a deep
  learning model to predict the presence or absense of a variety of species
  of common interest to wildlife researchers working with camera trap data.

  --tempdir PATH                 Path to temporary directory. If not
                                 specified, OS temporary directory is used.
  --proba_threshold FLOAT        Probability threshold for classification. if
                                 specified binary predictions are returned
                                 with 1 being greater than the threshold, 0
                                 being less than or equal to. If not
                                 specified, probabilities between 0 and 1 are
  --output_class_names           If True, we just return a video and the name
                                 of the most likely class. If False, we return
                                 a probability or indicator (depending on
                                 --proba_threshold) for every possible class.
  --model_profile TEXT           Defaults to 'full' which is slow and
                                 accurate; can be 'fast' which is faster and
                                 less accurate.
  --weight_download_region TEXT  Defaults to 'us', can also be 'eu' or 'asia'.
                                 Region for server to download weights.
  --verbose                      Displays additional logging information
                                 during processing.
  --help                         Show this message and exit.

Next Steps

This is just the tip of the iceberg. zamba has more options for command line use, and can alsoe be used as a Python module, e.g., import zamba! See the docs for more information.