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llm_speaker_tagging

SLT 2024 Challenge: Track-2 Post-ASR-Speaker-Tagging Baseline and Instructions for Track-2

GenSEC Challenge Track-2 Introduction

SLT 2024 Challenge GenSEC Track 2: Post-ASR-Speaker-Tagging

  • Track-2 is a challenge track that aims to correct the speaker tagging of the ASR-generated transcripts tagged with a speaker diarization system.

  • Since the traditional speaker diarization systems cannot take lexical cues into account, leading to errors that disrupt the context of human conversations.

  • In the provided dataset, we refer to these erroneous transcript as err_source_text (Error source text). Here is an example.

  • Erroneous Original Transcript err_source_text:

[
{"session_id":"session_gen1sec2", "start_time":10.02, "end_time":11.74, "speaker":"speaker1", "words":"what should we talk about well i"},
{"session_id":"session_gen1sec2", "start_time":13.32, "end_time":17.08, "speaker":"speaker2", "words":"don't tell you what's need to be"},
{"session_id":"session_gen1sec2", "start_time":17.11, "end_time":17.98, "speaker":"speaker1", "words":"discussed"},
{"session_id":"session_gen1sec2", "start_time":18.10, "end_time":19.54, "speaker":"speaker2", "words":"because that's something you should figure out"},
{"session_id":"session_gen1sec2", "start_time":20.10, "end_time":21.40, "speaker":"speaker1", "words":"okay, then let's talk about our gigs sounds"},
{"session_id":"session_gen1sec2", "start_time":21.65, "end_time":23.92, "speaker":"speaker2", "words":"good do you have any specific ideas"},
]

Note that the word well i, discussed and sounds are tagged with wrong speakers.

  • We expect track2 participants to generate the corrected speaker taggings.
  • Corrected Transcript Example (hypothesis):
[
 {"session_id":"session_gen1sec2", "start_time":0.0, "end_time":0.0, "speaker":"speaker1", "words":"what should we talk about"},
 {"session_id":"session_gen1sec2", "start_time":0.0, "end_time":0.0, "speaker":"speaker2", "words":"well i don't tell you what's need to be discussed"},
 {"session_id":"session_gen1sec2", "start_time":0.0, "end_time":0.0, "speaker":"speaker2", "words":"because that's something you should figure out"},
 {"session_id":"session_gen1sec2", "start_time":0.0, "end_time":0.0, "speaker":"speaker1", "words":"okay then let's talk about our gigs"},
 {"session_id":"session_gen1sec2", "start_time":0.0, "end_time":0.0, "speaker":"speaker2", "words":"sounds good do you have any specific ideas"}
]
  • Note that start_time and end_time cannot be estimated so the timestamps are all assigned as 0.0.
  • Please ensure that the order of sentences is maintained so that the output transcripts can be evaluated correctly.
  • Dataset: All development set and evaluation set data samples are formatted in the seglst.json format, which is a list containing dictionary variables with the keys specified above:
{
"session_id": str, 
"start_time": float,
"end_time": float, 
"speaker": str,
"words": str,
}

Track-2 Rules and Regulations

  1. The participants should only use text (transcripts) as the only modality. We do not provide any speech (audio) signal for the transcripts.
  2. The participants are allowed to correct the words (e.g. spk1:hi are wow to spk1:how are you) without changing the speaker labels. That is, this involves Track-1 in a way.
  3. The participants are allowed to use any type of language model and methods.
  • It does not need to be instruct (chat-based) large language models such as GPTs, LLaMa.
  • No restrictions on the parameter size of the LLM.
  • The participants can use prompt tuning, model alignment or any type of fine-tuning methods.
  • The participants are also allowed to use beam search decoding techniques with LLMs.

  1. The submitted system output format should be session by session seglst.json format and evaluated by cpwer metric.

  2. The participants will submit two json files:

    (1) err_dev.hyp.seglst.json
    (2) err_eval.hyp.seglst.json

    for both dev and eval set, respectively.

  3. In each err_dev.hyp.seglst.json err_eval.hyp.seglst.json, there is only one list containing the all 142 (dev), 104 (eval) sessions and each session is separated by session_id key.

  • Example of the final submission form err_dev.hyp.seglst.json and err_eval.hyp.seglst.json:
[
 {"session_id":"session_abc123ab", "start_time":0.0, "end_time":0.0, "speaker":"speaker1", "words":"well it is what it is"},
 {"session_id":"session_abc123ab", "start_time":0.0, "end_time":0.0, "speaker":"speaker2", "words":"yeah so be it"},
 {"session_id":"session_xyz456cd", "start_time":0.0, "end_time":0.0, "speaker":"speaker1", "words":"wow you are late again"},
 {"session_id":"session_xyz456cd", "start_time":0.0, "end_time":0.0, "speaker":"speaker2", "words":"sorry traffic jam"},
 {"session_id":"session_xyz456cd", "start_time":0.0, "end_time":0.0, "speaker":"speaker3", "words":"hey how was last night"}
]

Baseline System Introduction: Contextudal Beam Search Decoding

The baseline system is based on the system proposed in Enhancing Speaker Diarization with Large Language Models: A Contextual Beam Search Approach (We refer to this method as Contextual Beam Search (CBS)). Note that Track-2 GenSEC challenge only allows text modality, so this method injects placehold probabilities represented by peak_prob.

The prposed CBS method brings the beam search technique used for ASR language model to speaker diarization.

Two Realms

In CBS method, the following three probability values are needed:

P(E|S): Speaker diarization posterior probability (Given speaker S, acoustic observation E)
P(W): th probability of the next word W
P(S|W): the conditional probability value of the speaker S given the next word

BSD Equation

Note that the CBS approach assumes that one word is spoken by one speaker. In this baseline system, a placeholder speaker probability peak_prob is added since we do not have access to acoustic-only speaker diarization system.

Word Level Speaker Probability

The following diagram explains how beam search decoding works with speaker diarization and ASR.

Example of beam search decoding with scores

The overall data-flow is shown as follows. Note that we have fixed value for speaker probability values.

Overall Dataflow

Baseline System Installation

Run the following commands at the main level of this repository.

Conda Environment

The baseline system works with conda environment with python 3.10.

conda create --name llmspk python=3.10

Install requirements

You need to install the following packages 

kenlm
arpa
numpy
hydra-core
meeteval
tqdm
requests
simplejson
pydiardecode @ git+https://github.com/tango4j/pydiardecode@main

Simply install all the requirments. 

pip install -r requirements.txt

Download ARPA language model 

mkdir -p arpa_model
cd arpa_model
wget https://kaldi-asr.org/models/5/4gram_small.arpa.gz
gunzip 4gram_small.arpa.gz

Download track-2 challenge dev set and eval set

Clone the dataset from Hugging Face server.

git clone https://huggingface.co/datasets/GenSEC-LLM/SLT-Task2-Post-ASR-Speaker-Tagging

In folder, you will see the following folder structures.

.
├── err_source_text
│   ├── dev
│   │   ├── session_014b5cda.seglst.json
│   │   ├── session_02d73d95.seglst.json
│.
│..
│   │   ├── session_fcd0a550.seglst.json
│   │   └── session_ff16b903.seglst.json
│   └── eval
│       ├── session_0259446c.seglst.json
│       ├── session_0bea34fa.seglst.json
│..
│...
│       ├── session_f84edf1f.seglst.json
│       └── session_febfa7aa.seglst.json
├── ref_annotated_text
│   └── dev
│       ├── session_014b5cda.seglst.json
│       ├── session_02d73d95.seglst.json
│.
│..
│       ├── session_fcd0a550.seglst.json
│       └── session_ff16b903.seglst.json

The file counts are as follows:

  • err_source_text: dev 142 files, eval 104 files
  • ref_annotated_text: dev 142 files

Run the following commands to construct the input list files err_dev.src.list and err_dev.ref.list.

find $PWD/SLT-Task2-Post-ASR-Speaker-Tagging/err_source_text/dev -maxdepth 1 -type f -name "*.seglst.json" > err_dev.src.list
find $PWD/SLT-Task2-Post-ASR-Speaker-Tagging/ref_annotated_text/dev -maxdepth 1 -type f -name "*.seglst.json" > err_dev.ref.list

Launch the baseline script

Now you are ready to launch the baseline script. Launch the baseline script run_speaker_tagging_beam_search.sh

BASEPATH=${PWD}
DIAR_LM_PATH=$BASEPATH/arpa_model/4gram_small.arpa
ASRDIAR_FILE_NAME=err_dev
OPTUNA_STUDY_NAME=speaker_beam_search_${ASRDIAR_FILE_NAME}
WORKSPACE=$BASEPATH/SLT-Task2-Post-ASR-Speaker-Tagging
INPUT_ERROR_SRC_LIST_PATH=$BASEPATH/$ASRDIAR_FILE_NAME.src.list
GROUNDTRUTH_REF_LIST_PATH=$BASEPATH/$ASRDIAR_FILE_NAME.ref.list
DIAR_OUT_DOWNLOAD=$WORKSPACE/$ASRDIAR_FILE_NAME
mkdir -p $DIAR_OUT_DOWNLOAD


### SLT 2024 Speaker Tagging Setting v1.0.2
ALPHA=0.4
BETA=0.04
PARALLEL_CHUNK_WORD_LEN=100
BEAM_WIDTH=16
WORD_WINDOW=32
PEAK_PROB=0.95
USE_NGRAM=True
LM_METHOD=ngram

# Get the base name of the test_manifest and remove extension
UNIQ_MEMO=$(basename "${INPUT_ERROR_SRC_LIST_PATH}" .json | sed 's/\./_/g') 
echo "UNIQ MEMO:" $UNIQ_MEMO
TRIAL=telephonic
BATCH_SIZE=11

python $BASEPATH/speaker_tagging_beamsearch.py \
    hyper_params_optim=false \
    port=[5501,5502,5511,5512,5521,5522,5531,5532] \
    arpa_language_model=$DIAR_LM_PATH \
    batch_size=$BATCH_SIZE \
    groundtruth_ref_list_path=$GROUNDTRUTH_REF_LIST_PATH \
    input_error_src_list_path=$INPUT_ERROR_SRC_LIST_PATH \
    parallel_chunk_word_len=$PARALLEL_CHUNK_WORD_LEN \
    use_ngram=$USE_NGRAM \
    alpha=$ALPHA \
    beta=$BETA \
    beam_width=$BEAM_WIDTH \
    word_window=$WORD_WINDOW \
    peak_prob=$PEAK_PROB \

Evaluate

We use MeetEval software to evaluate cpWER. cpWER measures both speaker tagging and word error rate (WER) by testing all the permutation of trancripts and choosing the permutation that gives the lowest error.

echo "Evaluating the original source transcript."
meeteval-wer cpwer -h $WORKSPACE/$ASRDIAR_FILE_NAME.src.seglst.json -r $WORKSPACE/$ASRDIAR_FILE_NAME.ref.seglst.json 
echo "Source     cpWER: " $(jq '.error_rate' "[ $WORKSPACE/$ASRDIAR_FILE_NAME.src.seglst_cpwer.json) ]"

echo "Evaluating the original hypothesis transcript."
meeteval-wer cpwer -h $WORKSPACE/$ASRDIAR_FILE_NAME.hyp.seglst.json -r $WORKSPACE/$ASRDIAR_FILE_NAME.ref.seglst.json 
echo "Hypothesis cpWER: " $(jq '.error_rate'  $WORKSPACE/$ASRDIAR_FILE_NAME.hyp.seglst_cpwer.json)

The cpwer result will be stored in ./SLT-Task2-Post-ASR-Speaker-Tagging/err_dev.hyp.seglst_cpwer.json file.

cat ./SLT-Task2-Post-ASR-Speaker-Tagging/err_dev.hyp.seglst_cpwer.json`

The result file contains a json-dictionary. "error_rate" is the cpwer value we want to minimize.

{
  "error_rate": 0.18784847090516965,
  "errors": 73077,
  "length": 389021,
  "insertions": 13739,
  "deletions": 42173,
  "substitutions": 17165,
  "reference_self_overlap": null,
  "hypothesis_self_overlap": null,
  "missed_speaker": 0,
  "falarm_speaker": 6,
  "scored_speaker": 330,
  "assignment": null
}

Appendix A: LLM example of speaker tagging correction

This is an example of GPT-based speaker tagging correction. The following text is the prompt fed into Chat-GPT (GPT-4), including the example in this document.

- Track-2 is a challenge track that aims to correct the speaker tagging of the ASR-generated transcripts tagged with a speaker diarization system.  
- Since the traditional speaker diarization systems cannot take lexical cues into account, leading to errors that disrupt the context of human conversations.
- In the provided dataset, we refer to these erroneous transcript as `err_source_text` (Error source text). Here is an example.

- Erroneous Original Transcript `err_source_text`:

[
{"session_id":"session_gen1sec2", "start_time":10.02, "end_time":11.74, "speaker":"speaker1", "words":"what should we talk about well i"},
{"session_id":"session_gen1sec2", "start_time":13.32, "end_time":17.08, "speaker":"speaker2", "words":"don't tell you what's need to be"},
{"session_id":"session_gen1sec2", "start_time":17.11, "end_time":17.98, "speaker":"speaker1", "words":"discussed"},
{"session_id":"session_gen1sec2", "start_time":18.10, "end_time":19.54, "speaker":"speaker2", "words":"because that's something you should figure out"},
{"session_id":"session_gen1sec2", "start_time":20.10, "end_time":21.40, "speaker":"speaker1", "words":"okay then let's talk about our gigs sounds"},
{"session_id":"session_gen1sec2", "start_time":21.65, "end_time":23.92, "speaker":"speaker2", "words":"good do you have any specific ideas"},
]

Relocate the words to make the conversation looks and sounds natural.
- Do not add or remove words.
- Do not switch the speaker labels. 
- Do not change speaker1 to speaker2 or speaker2 to speaker 1.
- Move one or two words to other speakers dictionary to make the conversation sound correct.
  • The answer from GPT-4 (Tested on 05/01/2024).
To correct the conversation's flow in the transcript, I'll rearrange the words between the speakers while keeping the speakers consistent with the rules you provided. Here is the corrected version:

json [code]
[
    {"session_id":"session_gen1sec2", "start_time":10.02, "end_time":11.74, "speaker":"speaker1", "words":"what should we talk about"},
    {"session_id":"session_gen1sec2", "start_time":13.32, "end_time":17.08, "speaker":"speaker2", "words":"well i don't tell you what's need to be"},
    {"session_id":"session_gen1sec2", "start_time":17.11, "end_time":17.98, "speaker":"speaker1", "words":"discussed"},
    {"session_id":"session_gen1sec2", "start_time":18.10, "end_time":19.54, "speaker":"speaker2", "words":"because that's something you should figure out"},
    {"session_id":"session_gen1sec2", "start_time":20.10, "end_time":21.40, "speaker":"speaker1", "words":"okay then let's talk about our gigs"},
    {"session_id":"session_gen1sec2", "start_time":21.65, "end_time":23.92, "speaker":"speaker2", "words":"sounds good do you have any specific ideas"}
]

Here are the changes I made:

I moved "well i" from speaker1's first utterance to the beginning of speaker2's first utterance to better connect the dialogue.
"sounds" was moved to the beginning of speaker2's last utterance to better transition from speaker1's proposal to discuss their gigs.

In this example, note that the word well i, and sounds are corrected properly while GPT-4 missed discussed and left it assigned to speaker1.

  • The answer from Llama3 (Tested on 05/01/2024).
Here is the relocated transcript to make the conversation sound natural:
[
{"session_id":"session_gen1sec2", "start_time":10.02, "end_time":11.74, "speaker":"speaker1", "words":"what should we talk about"},
{"session_id":"session_gen1sec2", "start_time":13.32, "end_time":15.08, "speaker":"speaker1", "words":"well i don't tell you what's need to be"},
{"session_id":"session_gen1sec2", "start_time":15.11, "end_time":17.08, "speaker":"speaker2", "words":"discussed because that's something you should figure out"},
{"session_id":"session_gen1sec2", "start_time":18.10, "end_time":19.54, "speaker":"speaker1", "words":"okay then let's talk about our gigs"},
{"session_id":"session_gen1sec2", "start_time":21.65, "end_time":22.40, "speaker":"speaker1", "words":"sounds good"},
{"session_id":"session_gen1sec2", "start_time":22.45, "end_time":23.92, "speaker":"speaker2", "words":"do you have any specific ideas"},
]
I made some adjustments to the words to make the conversation flow naturally. Let me know if this meets your requirements!

In this Llama3 example, note that the word well, i and sounds are corrected but nearly all sentences got swapped speaker labels.

Reference

@inproceedings{park2024enhancing, title={Enhancing speaker diarization with large language models: A contextual beam search approach}, author={Park, Tae Jin and Dhawan, Kunal and Koluguri, Nithin and Balam, Jagadeesh}, booktitle={ICASSP 2024-2024 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, pages={10861--10865}, year={2024}, organization={IEEE} }

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