features

Explore morphological features in a language.

Alias: f

Synopsis

unimorph features [OPTIONS]

Description

Explore the morphological features used in a language dataset. View unique feature values, their frequencies, search for entries with specific features, or analyze feature positions.

Options

Option	Description
`-l, --lang <LANG>`	Language code (ISO 639-3)
`--list`	List all unique feature values
`--stats`	Show feature value counts (histogram)
`--search <FEATURE>`	Search for entries containing a specific feature
`--position <N>`	Show values at a specific position (0-indexed)
`--limit <N>`	Limit number of results (default: 50)
`--json`	Output as JSON

Examples

Feature Structure Overview

unimorph features -l heb

Feature structure for heb:

  Position 0: 3 unique values (e.g., V, N, V.MSDR)
  Position 1: 6 unique values (e.g., 2, 3, 1)
  Position 2: 6 unique values (e.g., SG, PL, PRS)
  Position 3: 11 unique values (e.g., FUT, PST, IMP)
  Position 4: 2 unique values (e.g., FEM, MASC)

Use --list for all unique values, --stats for counts, --search <FEATURE> to find entries.

List All Features

unimorph features -l heb --list

Unique features in heb:

  1
  2
  3
  DEF
  FEM
  FUT
  IMP
  MASC
  N
  ...

24 unique feature values.

Feature Statistics

unimorph features -l heb --stats

Feature statistics for heb:

FEATURE              COUNT
----------------------------------------
V                    28663
SG                   16226
PL                   15158
FEM                  12384
MASC                 12384
2                    12108
FUT                  10400
PST                  9378
3                    7286
1                    4164
... and 14 more

Search by Feature

unimorph features -l heb --search FUT --limit 5

Entries with feature 'FUT':

LEMMA                FORM                 FEATURES
------------------------------------------------------------
איבד                 אאבד                 V;1;SG;FUT
איבזר                אאבזר                V;1;SG;FUT
איבטח                אאבטח                V;1;SG;FUT
האביס                אאביס                V;1;SG;FUT
אבל                  אאבל                 V;1;SG;FUT

Showing 5 of 10400 results.

Analyze Feature Position

unimorph features -l heb --position 0

Feature values at position 0 in heb:

VALUE                COUNT
----------------------------------------
V                    28663
N                    3338
V.MSDR               1176

JSON Output

unimorph features -l heb --stats --json

{
  "V": 28663,
  "SG": 16226,
  "PL": 15158,
  ...
}

Pipe-Friendly Output

When piped, outputs clean format:

# Get just feature names
unimorph features -l heb --list | head -5

1
2
3
DEF
FEM

# Feature counts as TSV
unimorph features -l heb --stats | head -5

V	28663
SG	16226
PL	15158
FEM	12384
MASC	12384

Use Cases

Understanding a language: See what features are used
Finding examples: Search for entries with specific features
Data exploration: Analyze feature distribution
Building queries: Discover feature names for search filters

UniMorph-rs