grand-challenge.org has a system for automatically evaluating new submissions. Challenge administrators upload their own Docker containers that will be executed by Celery workers when a new submission in uploaded by a participant.

Evaluation Container Requirements

The evaluation container must contain everything that is needed to perform the evaluation on a new submission. This includes the reference standard, and the code that will execute the evaluation on the new submission. An instance of the evaluation container image is created for each submission.


The participants submission will be extracted and mounted as a docker volume on /input/.


The container will be run with the default arguments, so the entrypoint must by default produce an evaluation for the data that will reside on /input/. The container is responsible for loading all of the data, handling incorrect filenames, incomplete submissions, duplicate folders, etc.


If there is an error in the evaluation process grand-challenge.org will parse stderr and return the last non-empty line to the user. If your evaluation script is in Python the best practice is to raise an exception and the message will then be passed to the user, eg

raise AttributeError(‘Expected to find 10 images, you submitted 5’)


The container must produce the file /output/metrics.json. The structure within must be valid json (ie. loadable with json.loads()) and will be stored as a result in the database. The challenge administrator is free to define what metrics are included. We recommend storing results in two objects - case for the scores on individual cases (eg, scans), and aggregates for when there is one number per evaluation. For example:

  "case": {
    "dicecoefficient": {
      "0": 0.6461774875144065,
      "1": 0.7250400040547097,
      "2": 0.6747092236948878,
      "3": 0.6452332692745784,
      "4": 0.6839602948067993,
      "5": 0.6817807628480707,
      "6": 0.4715406247268339,
      "7": 0.5988810496224731,
      "8": 0.5475856316815167,
      "9": 0.32923801642370615
    "jaccardcoefficient": {
      "0": 0.47729852440408627,
      "1": 0.5686766693547471,
      "2": 0.5091027839007266,
      "3": 0.47626890640360103,
      "4": 0.5197109875240358,
      "5": 0.5171983108978807,
      "6": 0.30850713624139353,
      "7": 0.4274305543159676,
      "8": 0.3770174983296798,
      "9": 0.1970585994056237
    "alg_fname": {
      "0": "1.2.840.113704.1.111.2296.1199810886.7.mhd",
      "1": "",
      "2": "",
      "3": "1.2.840.113704.1.111.2004.1131987870.11.mhd",
      "4": "1.2.840.113704.1.111.2296.1199810941.11.mhd",
      "5": "1.2.840.113704.1.111.4400.1131982359.11.mhd",
      "6": "",
      "7": "",
      "8": "1.2.392.200036.9116.",
      "9": "2.16.840.1.113669.632.21.3825556854.538251028.390606191418956020.mhd"
    "gt_fname": {
      "0": "1.2.840.113704.1.111.2296.1199810886.7.mhd",
      "1": "",
      "2": "",
      "3": "1.2.840.113704.1.111.2004.1131987870.11.mhd",
      "4": "1.2.840.113704.1.111.2296.1199810941.11.mhd",
      "5": "1.2.840.113704.1.111.4400.1131982359.11.mhd",
      "6": "",
      "7": "",
      "8": "1.2.392.200036.9116.",
      "9": "2.16.840.1.113669.632.21.3825556854.538251028.390606191418956020.mhd"
  "aggregates": {
    "dicecoefficient_mean": 0.6004146364647982,
    "dicecoefficient_std": 0.12096508479974993,
    "dicecoefficient_min": 0.32923801642370615,
    "dicecoefficient_max": 0.7250400040547097,
    "jaccardcoefficient_mean": 0.4378269970777743,
    "jaccardcoefficient_std": 0.11389145837530869,
    "jaccardcoefficient_min": 0.1970585994056237,
    "jaccardcoefficient_max": 0.5686766693547471,

Evaluation Options

class grandchallenge.evaluation.models.Phase(id, created, modified, challenge, archive, title, slug, score_title, score_jsonpath, score_error_jsonpath, score_default_sort, score_decimal_places, extra_results_columns, scoring_method_choice, result_display_choice, creator_must_be_verified, submission_kind, allow_submission_comments, display_submission_comments, supplementary_file_choice, supplementary_file_label, supplementary_file_help_text, show_supplementary_file_link, publication_url_choice, show_publication_url, daily_submission_limit, submissions_open, submissions_close, submission_page_html, auto_publish_new_results, display_all_metrics, evaluation_detail_observable_url, evaluation_comparison_observable_url)[source]
exception DoesNotExist
exception MultipleObjectsReturned
class SubmissionKind(value)[source]

An enumeration.

save(*args, **kwargs)[source]

Save the current instance. Override this in a subclass if you want to control the saving process.

The ‘force_insert’ and ‘force_update’ parameters can be used to insist that the “save” must be an SQL insert or update (or equivalent for non-SQL backends), respectively. Normally, they should not be set.

Template Tags

grandchallenge.evaluation.templatetags.evaluation_extras.get_jsonpath(obj, jsonpath)[source]

Gets a value from a dictionary based on a jsonpath. It will only return one result, and if a key does not exist it will return an empty string as template tags should not raise errors.

  • obj (dict) – The dictionary to query

  • jsonpath – The path to the object (singular)


The most relevant object in the dictionary