Impression
An impression is an immutable snapshot of a task or an algorithm. It is uniquely defined by:
- the project UUID,
- all preceding impressions,
- the contents of the corresponding task or algorithm.
From the perspective of an impression, it is an isolated component that only sees its connected objects:
imp8c340c/
├── contents/ # the contents of itself
├── code -> ... # symlink to the impression of the algorithm
├── inputname -> ... # symlink to the impression of the input task
└── stageout/ # empty folder to store outputs
The impression system records the entire history of the project through these connections.
Properties
- Version the data without versioning the data — instead of storing datasets, an impression records the exact execution provenance: code hash, inputs, and parameter states.
- Immutable once created — so the results it produces are feasible and reliable.
- README.md is not included — only files that can change results are sealed, so after running your job you are free to polish the documentation.
celebi-cli make-impression "preselection v1"