prannerta100/iwslt2026-lowres-st-submission

Submission for the IWSLT 2026 Low Resource Track # IWSLT 2026 Low-Resource Speech Translation Submission Dual-pipeline system for the IWSLT 2026 Low-Resource ST shared task, targeting all 10 language pairs with a unified approach that combines cascaded and end-to-end speech translation with MBR ensemble decoding. ## Architecture ``` ┌──────────────────────────────┐ │ Source Audio │ └──────────┬───────────────────┘ │ ┌───────────────┴───────────────┐ ▼ ▼ ┌─────────────────────┐ ┌─────────────────────────┐ │ Pipeline A: Cascade │ │ Pipeline B: End-to-End │ │ │ │ │ │ Whisper large-v3 │ │ SeamlessM4T v2 large │ │ (LoRA, MTL ASR+ST) │ │ (LoRA fine-tuned) │ │ │ │ │ │ │ ▼ │ │ Direct ST output │ │ NLLB-200 1.3B │ │ + N-best hypotheses │ │ (intra-distill.) │ │ │ │ │ │ └────────────┬────────────┘ │ N-best hyps │ │ └─────────┬───────────┘ │ │ │ └────────────┬───────────────────┘ ▼ ┌─────────────────────────┐ │ MBR Decoding (chrF) │ │ 50+50 hypotheses │ │ Select best per utt. │ └────────────┬────────────┘ ▼ Final Translation ``` ## Language Pairs | Pair | Direction | Data | Pipeline Notes | |------|-----------|------|----------------| | arn-spa | Mapuzugun → Spanish | ~130h | E2E primary (not in NLLB) | | bem-eng | Bemba → English | ~180h | Cascade + E2E | | bho-hin | Bhojpuri → Hindi | ~26h | Pseudo-translation trick | | ckb-eng | C. Kurdish → English | ~30h | Cascade + E2E | | gle-eng | Irish → English | ~25h | Cascade + E2E | | ibo-eng | Igbo → English | ~20h | Cascade + E2E | | hau-eng | Hausa → English | ~20h | Cascade + E2E | | que-spa | Quechua → Spanish | ~58h | Cascade + E2E | | ca-en | Catalan → English | ~30h | Whisper direct ST available …