REVIEW 3 major objections 2 minor 35 references
NAVER LABS Europe Submission to the Instruction-following Track
T0 review · 3 major / 2 minor · reviewed 2026-08-07 · deepseek-v4-flash
Pith's one-line read A speech projector and text LoRA adapters, trained apart, fuse in 1,000 joint steps into a model that beats speech-only systems on ASR, ST, and spoken QA.
desk verdict The parallel-projector-plus-LoRA recipe is genuinely useful, but the SQA numbers and the Seamless comparison need to be fixed before I trust the headline claims. read the letter →
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
The reading
What carries the argument
The load-bearing pieces are three. (1) A speech projector: a four-layer transformer encoder that maps averaged speech representations from a large pretrained multilingual speech encoder into the embedding space of a frozen instruction-tuned 8-billion-parameter LLM, letting the LLM consume audio as if it were text. (2) Text LoRA adapters: low-rank updates to the attention and feed-forward weights of the same frozen LLM, trained on text-only translation and QA data. (3) The C-stage alignment: loading both modules and running 1K instruction-tuning steps over interleaved speech and text batches, with the textual batches acting as a stabilizing signal; the authors ablate that a randomly initialized LoRA gives less gain than the pretrained text LoRA. Averaging every third frame of the speech encoder output also shortens sequences so larger batches fit in memory.
What would settle it
Score the submitted A.1+B fluent model's outputs on the multilingual SpokenSQuAD test set with the organizers' BERT-score settings; if the en-de, en-it, and en-zh BERT scores remain near the reported 0.532-0.666 range while the LLM judge reports 76-85% accuracy, the SQA claim fails under the official metric.
Extended reading notes
Core claim
The paper's central discovery is that separately trained modality adapters can be merged into a competent multimodal system by a brief alignment stage. On its own, the speech projector trained with ASR, ST, and SQA data could transcribe and translate but essentially could not perform spoken question answering; the text-only LoRA could handle QA on text but had no speech input. After the two are loaded together and instruction-tuned for 1K steps on mixed speech and text batches, the resulting model answers spoken questions at close to the text-only topline according to the authors' LLM-as-a-judge evaluation, improves ASR by about 1-2 WER points and translation BLEU over projector-only models, and handles all three tasks from the same set of weights. The authors interpret this as evidence that text and speech adaptation can be optimized independently and then aligned with a small amount of joint multimodal data.
Load-bearing premise
The spoken-QA gains are measured with an LLM-as-a-judge accuracy score that the paper's own Table 8 shows can diverge sharply from the official BERT-score metric for the same outputs, so if that judge is not a faithful measure, the central SQA claim is not established.
Editorial extensions
If this is right
- A 1,000-step joint tuning stage is enough to fuse separately pretrained modality adapters; the paper's ablations show 2K steps mainly saturate or hurt, so the merge is cheap.
- Adding the text modality during fusion improves speech translation most in the low-resource direction (Italian), suggesting textual supervision acts as a helpful regularizer when speech data are scarce.
- Regenerating extractive QA answers as fluent sentences before training sharply improves spoken QA scores, at a small ASR cost, and is the variant chosen for the submitted system.
- The speech projector alone, even when trained with SQA data, fails to produce SQA answers; the reasoning-style task only becomes learnable once the text LoRA and the projector are aligned in the C stage.
Reading between the lines
- Editorial extension: the same parallel-then-align recipe may transfer to other modalities; a vision or audio adapter and a text-specialized LoRA could be pretrained independently and fused with a short joint stage, provided the alignment data is representative.
- Editorial extension: the paper's own comparison between its LLM judge and the organizers' BERT-score protocol indicates the near-topline spoken-QA result is not yet settled; before using this model as a QA system, one should re-score outputs with the official metric.
- Editorial extension: the fluent-answer regeneration step was motivated by domain shift from extractive answers, but the same idea could be tested as a general data augmentation for any extractive QA dataset feeding an LLM, since it converts exact spans into natural sentence-level supervision.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper describes NAVER LABS Europe's constrained submission to the IWSLT 2025 instruction-following speech processing track. The proposed pipeline trains a speech projector (A) on ASR/ST or ASR/ST/SQA data and text LoRA adapters (B) on MT/QA data in parallel, then merges them via a short joint instruction-tuning stage (C) of 1K steps. Results are reported for ASR, ST, and SQA on the ACL 60-60 and SpokenSQuAD test sets, with ablations on the adaptation stage, synthetic data, and task ratios. The central structural claim is that the parallel-training-plus-short-alignment recipe works: the multimodal models outperform the projector-only models on ASR and ST and make the speech model capable of SQA, which the projector alone could not do.
Significance. If confirmed, the A+B+C recipe is a practically useful and inexpensive way to add speech capabilities to a frozen instruction-tuned LLM without training a full multimodal model from scratch. The paper's strengths include clear descriptions of the data pipeline, detailed hyperparameter reporting, and a valuable control in Table 10 comparing a randomly initialized LoRA with the pretrained LoRA during the merging step. The paper is also transparent about the discrepancy between its LLM-as-a-judge SQA scores and the organizers' BERT-score results. However, the SQA conclusions are carried entirely by the LLM-as-judge metric, which the paper itself shows diverges sharply from the official protocol, and one explicit comparative claim is contradicted by the paper's own table. These issues need to be resolved before the central claims can be accepted.
major comments (3)
- [Section 5.2, Final Discussion and Table 2] The sentence in the Final Discussion that the models 'outperform SeamlessM4T-v2-large across all language pairs and metrics' is directly contradicted by Table 2. For en-it BLEU, SeamlessM4T-v2-large scores 43.54 while A.1+B (fluent) scores 40.48; for ASR WER, SeamlessM4T-v2-large scores 17.6 while the best multimodal models score 18.6. The claim should be corrected to identify the specific language pairs and metrics where the submission is better, and the exceptions should be acknowledged.
- [Appendix C.2.1, Tables 2 and 8] The SQA results in Table 2 are not supported by the paper's own Table 8. For the submitted model A.1+B (fluent) on valid en-de SQA, Table 2 reports 85.2% LLM-as-judge accuracy, while Table 8 reports a BERT score of 0.532 using the organizers' protocol. Table 8 also shows near-0.99 BERT scores on invalid questions, so the gap is not a uniform offset between metrics. Since the claims that multimodal training enables SQA and approaches the text-only topline are based entirely on the LLM-as-judge numbers, the SQA component of the central claim is not currently established. Please validate the LLM-as-judge metric against the reference-based metric, report both sets of numbers in the main table, or substantially soften the SQA claims.
- [Appendix C.2, 'Task Ratios' and Table 11] Table 11 reports ASR/ST/SQA task-ratio sweeps, and the text states that the ratio was selected as the one with the best average WER and BLEU over 'both ACL 60-60 dev and test set.' Because Table 2 reports results on the ACL 60-60 eval set, the reported ASR/ST numbers for the final configuration are affected by test-set selection. This makes the gains of the chosen task ratio optimistic and weakens the ablation's validity. Please rerun the sweep using only the dev set, or explicitly state that the final test-set numbers include selection bias.
minor comments (2)
- [Appendix C.2, 'Inclusion of Synthetic Textual Data'] The paragraph says 'Table 11 presents the results of our investigation into the inclusion of potentially noisy synthetic textual data,' but the synthetic-data rows (No synthetic data, Only synthetic data) appear in Table 10, not Table 11. The cross-reference should be corrected.
- [Table 1] The entry '34, 003†' contains an extra space inside the number; this is a formatting typo.
Circularity Check
No significant circularity: the paper is an empirical system description whose central claims are supported by benchmark comparisons against external baselines, not by a derivation from its own assumptions.
full rationale
This is an empirical system paper with no mathematical derivation targeted at a predicted quantity. The pipeline is: train a speech projector (A) on speech-to-text data, train text LoRA adapters (B) on text-to-text data, then jointly adapt both for 1K steps (C). The paper's central claim, that this parallel training followed by short joint instruction tuning works, is supported by measured results on external benchmarks (ACL 60-60 for ASR/ST, SpokenSQuAD for SQA) and by comparison with external baselines (SeamlessM4T-v2-large, Llama-3.1-8B-Instruct). SeamlessM4T-v2-large is used both to synthesize training data and as an evaluation baseline, but this is not circular: the baseline appears only in evaluation comparisons and is not embedded in the training objective. No fitted parameter is renamed as a prediction, no self-defined quantity is shown to equal another by construction, and no uniqueness theorem or ansatz is imported from the authors' prior work to force a choice. The paper contains self-citations, notably the bergen library [24] used for the LLM-as-judge evaluation, but this is tooling support, not load-bearing evidence for the central claim. The acknowledged discrepancy between the authors' LLM-judge SQA metric and the organizers' BERT-score evaluation (Appendix C.2.1, Tables 2 and 8) is a measurement-validity concern about the SQA results, not a circularity: the metric is not derived from the model's training objective or from the fitted parameters. Accordingly, no circular step can be exhibited, and the correct finding is no significant circularity.
Assumptions & free parameters
free parameters (5)
- Task sampling ratios for multimodal training =
ASR 0.2, ST 0.4, SQA 0.4
- Multimodal adaptation steps =
1,000
- ST language sampling ratios (A.1) =
en-de 0.3, en-zh 0.4, en-it 0.3
- COMET filter threshold for multilingual SQA =
0.85
- LoRA rank and alpha =
rank=8, alpha=16
assumptions (4)
- domain assumption SeamlessM4T-v2-large encoder features suffice for a lightweight projector to map to Llama embeddings
- domain assumption Llama-3.1-8B-Instruct can perform ASR, ST, and SQA given projected speech embeddings
- domain assumption Synthetic data from SeamlessM4T-v2-large and Llama-3.1-8B-Instruct is faithful and useful for training
- domain assumption LLM-as-a-judge scores reflect true SQA correctness
Cite this review
Pith. "Pith review of NAVER LABS Europe Submission to the Instruction-following Track." pith.science (2026). https://pith.science/paper/MCTK5QOX
@misc{pith2026250601808,
author = {Pith},
title = {Pith review of: NAVER LABS Europe Submission to the Instruction-following Track},
year = {2026},
howpublished = {\url{https://pith.science/paper/MCTK5QOX}},
note = {Machine review of arXiv:2506.01808}
}
read the original abstract
In this paper we describe NAVER LABS Europe submission to the instruction-following speech processing short track at IWSLT 2025. We participate in the constrained settings, developing systems that can simultaneously perform ASR, ST, and SQA tasks from English speech input into the following target languages: Chinese, Italian, and German. Our solution leverages two pretrained modules: (1) a speech-to-LLM embedding projector trained using representations from the SeamlessM4T-v2-large speech encoder; and (2) LoRA adapters trained on text data on top of a Llama-3.1-8B-Instruct. These modules are jointly loaded and further instruction-tuned for 1K steps on multilingual and multimodal data to form our final system submitted for evaluation.
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Reviewed August 7, 2026 · model on record in the stance chip above.
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