---
library_name: transformers
pipeline_tag: automatic-speech-recognition
tags:
  - whisper
  - speech
  - swedish
  - telephonic
  - transformers
datasets:
  - WMRNORDIC/swedish-telephonic-dataset
metrics:
  - wer
base_model: openai/whisper-small
base_model_relation: finetune
license: apache-2.0
language:
  - sv
  - en
model-index:
  - name: whisper-swedish-telephonic
    results:
      - task:
          type: automatic-speech-recognition
          name: Automatic Speech Recognition
        dataset:
          name: Swedish Telephonic Dataset
          type: custom
          split: test
        metrics:
          - name: Word Error Rate (WER)
            type: wer
            value: 0.170
          - name: Base Model WER (Comparison)
            type: wer
            value: 0.888
---

# whisper-swedish-telephonic

## Model Overview
**`whisper-swedish-telephonic`** is a fine-tuned version of OpenAI's Whisper-Small model, specifically designed for transcribing Swedish telephonic audio. The model is optimized for low-bandwidth, multi-speaker conversations such as call center interactions.

### Key Features:
- **Language:** Swedish (primary), with limited support for minor English segments.
- **Audio Types:** Telephonic conversations, customer support recordings, and general low-bandwidth audio.
- **Sample Rate:** 8kHz (resampled to 16kHz internally).
- **Special Tokens:** Supports conversational markers, disfluencies, and speaker-specific tags.
- **Performance:** Demonstrates significantly improved transcription accuracy over the base model for telephonic speech.

---

## Dataset
The model was fine-tuned using the **Swedish Telephonic Dataset**, consisting of:

- **Duration:** ~97 hours of annotated audio.
- **Domains:** Call center recordings, customer service conversations.
- **Annotations:**
  - Speaker IDs and timestamps.
  - Conversational tags: `(())`, `~`, `<overlap>`.
  - Language switching: `<lang:English>...</lang:English>`.

### Preprocessing:
- **Audio:** Resampled to 16kHz.
- **Segmentations:** Aligned with timestamps.
- **Special Tokens:** Includes non-speech sounds like `[cough]`, `[laugh]`.

---

## Model Performance
### Word Error Rate (WER) Evaluation
The fine-tuned model was benchmarked against OpenAI's base Whisper-Small model using a Swedish telephonic test dataset containing 207 labeled speech segments.

| Metric   | Fine-Tuned Model | Base Whisper-Small |
|----------|------------------|--------------------|
| **WER**  | 0.170            | 0.888             |

### Key Observations:
- **Fine-Tuned Model:**
  - Excellent transcription accuracy for colloquial Swedish, domain-specific terminology, and long utterances.
  - Handles speaker-specific annotations and conversational markers effectively.
- **Base Model:**
  - Struggles with Swedish syntax and domain-specific vocabulary.
  - Outputs nonsensical transcriptions for longer or complex sentences.

---

## Example Transcriptions

| Segment | Ground Truth                                 | Fine-Tuned Model                         | Base Model           | WER (Fine-Tuned) | WER (Base) |
|---------|---------------------------------------------|------------------------------------------|----------------------|------------------|------------|
| 1       | så nu                                       | så nu                                    | so, no               | 0.000            | 1.000      |
| 2       | nu record du båda va                        | nu record du båda va                     | nu rekordar du båda  | 0.000            | 0.400      |
| 3       | ja jag kommer inte ihåg                     | ja jag kommer inte ihåg                  | i am coming to you   | 0.000            | 1.000      |
| 5       | sen när då, sen alltid... inga gäster       | sen när då, sen alltid... inga gäster    | sen då, sen alltid... ingen gest | 0.000 | 0.250      |
| 14      | till frankrike                              | till frankrike                           | thank you            | 0.000            | 1.000      |

**Note:** Full segment-wise evaluation logs are available in the repository.

---

## Audio Example
This audio file demonstrates the model's transcription abilities:

- **File:** [trimmed_resampled_audio.wav](https://huggingface.co/WMRNORDIC/whisper-swedish-telephonic/blob/main/trimmed_resampled_audio.wav)
- **Content:** *Hej du har kommit till Dressmann. Du pratar med Isabelle. Vad kan jag hjälpa dig?*
- **Audio Type:** Telephonic conversation.
- **Sample Rate:** 16kHz (resampled).
- **Purpose:** Showcasing the model's capabilities in transcribing Swedish telephonic speech.

---

## Intended Use
This model is designed for:
- **Customer Support Automation:** Transcription and analysis of call center recordings.
- **Telephony Analytics:** Sentiment analysis, compliance monitoring, and business intelligence.
- **Swedish Language Research:** Study of conversational patterns and colloquial expressions.

### Limitations:
- **Language Support:** Primarily Swedish; limited support for English.
- **Audio Quality:** Optimized for telephonic audio; performance may degrade with studio-quality or highly noisy audio.
- **Preprocessing Requirement:** Requires resampling non-8kHz audio to 16kHz.

---

## Try the Model
You can test the model using the Hugging Face Playground or the dedicated endpoint:

- **Playground:** [Test the Model](https://huggingface.co/WMRNORDIC/whisper-swedish-telephonic)
- **Dedicated Endpoint:** [Endpoint URL](https://zckhajpu2q8h0sjw.us-east-1.aws.endpoints.huggingface.cloud)

---

## How to Use
```python
from transformers import WhisperForConditionalGeneration, WhisperProcessor
import soundfile as sf

# Load model and processor
model_name = "WMRNORDIC/whisper-swedish-telephonic"
model = WhisperForConditionalGeneration.from_pretrained(model_name)
processor = WhisperProcessor.from_pretrained(model_name)

# Load and preprocess audio
audio, sample_rate = sf.read("path_to_audio.wav")
inputs = processor(audio, sampling_rate=sample_rate, return_tensors="pt")

# Transcribe
generated_ids = model.generate(inputs.input_features)
transcription = processor.batch_decode(generated_ids, skip_special_tokens=True)[0]

print("Transcription:", transcription)