Multi-Split Strategy (root_strategy: "multi_split")

Each split (e.g. train, dev, test) is stored in a separate file. The loader locates all matching files, filters by the configured split names, adds a split column to each, applies column mappings (when declared), and concatenates all frames into a single DataFrame. The split value is taken from the file stem.

Controlled by:

Field	Required	Description
splits	✓	List of split names to load (e.g. ["train", "dev", "test"]).
splits_file_pattern	✗	(optional) Glob pattern to locate split files (default: "**/*.tsv").
columns	✗	(optional) Column mappings applied to every split frame. When omitted, the raw columns plus split are returned.
base_audio_path	✗	(optional) Directory prefix or list of directories used to resolve file_path dtype columns.

---

Example

dataset_id: "cmj8u3okr0001nxxbeshupy5k"
task: "ASR"
root_strategy: "multi_split"

splits:
  - dev
  - invalidated
  - other
  - reported
  - test
  - train
  - validated

splits_file_pattern: "**/*.tsv"
base_audio_path: "clips/"

columns:
  audio_path:
    source_column: "path"
    dtype: "file_path"
  transcription:
    source_column: "sentence"
    dtype: "string"
  speaker_id:
    source_column: "client_id"
    dtype: "category"
    optional: true
  sentence_id:
    source_column: "sentence_id"
    dtype: "string"
    optional: true
  sentence_domain:
    source_column: "sentence_domain"
    dtype: "category"
    optional: true
  up_votes:
    source_column: "up_votes"
    dtype: "int"
    optional: true
  down_votes:
    source_column: "down_votes"
    dtype: "int"
    optional: true
  age:
    source_column: "age"
    dtype: "category"
    optional: true
  gender:
    source_column: "gender"
    dtype: "category"
    optional: true
  accents:
    source_column: "accents"
    dtype: "category"
    optional: true
  variant:
    source_column: "variant"
    dtype: "category"
    optional: true
  locale:
    source_column: "locale"
    dtype: "category"
    optional: true