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| import gradio as gr | |
| import json | |
| import librosa | |
| import os | |
| import soundfile as sf | |
| import tempfile | |
| import uuid | |
| from nemo.collections.asr.models import ASRModel | |
| SAMPLE_RATE = 16000 # Hz | |
| model = ASRModel.from_pretrained("nvidia/canary-1b") | |
| model.eval() | |
| MAX_AUDIO_SECONDS = 40 | |
| def convert_audio(audio_filepath, tmpdir, utt_id): | |
| """ | |
| Convert all files to monochannel 16 kHz wav files. | |
| Do not convert and raise error if audio too long. | |
| Returns output filename and duration. | |
| """ | |
| data, sr = librosa.load(audio_filepath) | |
| duration = librosa.get_duration(y=data, sr=sr) | |
| if duration > MAX_AUDIO_SECONDS: | |
| raise gr.Error( | |
| f"This demo can transcribe up to {MAX_AUDIO_SECONDS} seconds of audio." | |
| ) | |
| if sr != SAMPLE_RATE: | |
| data = librosa.resample(data, orig_sr=sr, target_sr=SAMPLE_RATE) | |
| # monochannel | |
| data = librosa.to_mono(data) | |
| out_filename = os.path.join(tmpdir, utt_id + '.wav') | |
| # save output audio | |
| sf.write(out_filename, data, SAMPLE_RATE) | |
| return out_filename, duration | |
| def transcribe(audio_filepath, src_lang, tgt_lang, pnc): | |
| if audio_filepath is None: | |
| raise gr.Error("Please provide some input audio: either upload an audio file or use the microphone") | |
| utt_id = uuid.uuid4() | |
| with tempfile.TemporaryDirectory() as tmpdir: | |
| converted_audio_filepath, duration = convert_audio(audio_filepath, tmpdir, str(utt_id)) | |
| # map src_lang and tgt_lang from long versions to short | |
| LANG_LONG_TO_LANG_SHORT = { | |
| "English": "en", | |
| "Spanish": "es", | |
| "French": "fr", | |
| "German": "de", | |
| } | |
| if src_lang not in LANG_LONG_TO_LANG_SHORT.keys(): | |
| raise ValueError(f"src_lang must be one of {LANG_LONG_TO_LANG_SHORT.keys()}") | |
| else: | |
| src_lang = LANG_LONG_TO_LANG_SHORT[src_lang] | |
| if tgt_lang not in LANG_LONG_TO_LANG_SHORT.keys(): | |
| raise ValueError(f"tgt_lang must be one of {LANG_LONG_TO_LANG_SHORT.keys()}") | |
| else: | |
| tgt_lang = LANG_LONG_TO_LANG_SHORT[tgt_lang] | |
| # infer taskname from src_lang and tgt_lang | |
| if src_lang == tgt_lang: | |
| taskname = "asr" | |
| else: | |
| taskname = "s2t_translation" | |
| # update pnc variable to be "yes" or "no" | |
| pnc = "yes" if pnc else "no" | |
| # make manifest file and save | |
| manifest_data = { | |
| "audio_filepath": converted_audio_filepath, | |
| "source_lang": src_lang, | |
| "target_lang": tgt_lang, | |
| "taskname": taskname, | |
| "pnc": pnc, | |
| "answer": "predict", | |
| "duration": str(duration), | |
| } | |
| manifest_filepath = os.path.join(tmpdir, f'{utt_id}.json') | |
| with open(manifest_filepath, 'w') as fout: | |
| line = json.dumps(manifest_data) | |
| fout.write(line + '\n') | |
| # call transcribe, passing in manifest filepath | |
| model_output = model.transcribe(manifest_filepath) | |
| return model_output[0] | |
| # add logic to make sure dropdown menus only suggest valid combos | |
| def on_src_or_tgt_lang_change(src_lang_value, tgt_lang_value, pnc_value): | |
| """Callback function for when src_lang or tgt_lang dropdown menus are changed. | |
| Args: | |
| src_lang_value(string), tgt_lang_value (string), pnc_value(bool) - the current | |
| chosen "values" of each Gradio component | |
| Returns: | |
| src_lang, tgt_lang, pnc - these are the new Gradio components that will be displayed | |
| Note: I found the required logic is easier to understand if you think about the possible src & tgt langs as | |
| a matrix, e.g. with English, Spanish, French, German as the langs, and only transcription in the same language, | |
| and X -> English and English -> X translation being allowed, the matrix looks like the diagram below ("Y" means it is | |
| allowed to go into that state). | |
| It is easier to understand the code if you think about which state you are in, given the current src_lang_value and | |
| tgt_lang_value, and then which states you can go to from there. | |
| tgt lang | |
| - |EN |ES |FR |DE | |
| ------------------ | |
| EN| Y | Y | Y | Y | |
| ------------------ | |
| src ES| Y | Y | | | |
| lang ------------------ | |
| FR| Y | | Y | | |
| ------------------ | |
| DE| Y | | | Y | |
| """ | |
| if src_lang_value == "English" and tgt_lang_value == "English": | |
| # src_lang and tgt_lang can go anywhere | |
| src_lang = gr.Dropdown( | |
| choices=["English", "Spanish", "French", "German"], | |
| value=src_lang_value, | |
| label="Input audio is spoken in:" | |
| ) | |
| tgt_lang = gr.Dropdown( | |
| choices=["English", "Spanish", "French", "German"], | |
| value=tgt_lang_value, | |
| label="Transcribe in language:" | |
| ) | |
| elif src_lang_value == "English": | |
| # src is English & tgt is non-English | |
| # => src can only be English or current tgt_lang_values | |
| # & tgt can be anything | |
| src_lang = gr.Dropdown( | |
| choices=["English", tgt_lang_value], | |
| value=src_lang_value, | |
| label="Input audio is spoken in:" | |
| ) | |
| tgt_lang = gr.Dropdown( | |
| choices=["English", "Spanish", "French", "German"], | |
| value=tgt_lang_value, | |
| label="Transcribe in language:" | |
| ) | |
| elif tgt_lang_value == "English": | |
| # src is non-English & tgt is English | |
| # => src can be anything | |
| # & tgt can only be English or current src_lang_value | |
| src_lang = gr.Dropdown( | |
| choices=["English", "Spanish", "French", "German"], | |
| value=src_lang_value, | |
| label="Input audio is spoken in:" | |
| ) | |
| tgt_lang = gr.Dropdown( | |
| choices=["English", src_lang_value], | |
| value=tgt_lang_value, | |
| label="Transcribe in language:" | |
| ) | |
| else: | |
| # both src and tgt are non-English | |
| # => both src and tgt can only be switch to English or themselves | |
| src_lang = gr.Dropdown( | |
| choices=["English", src_lang_value], | |
| value=src_lang_value, | |
| label="Input audio is spoken in:" | |
| ) | |
| tgt_lang = gr.Dropdown( | |
| choices=["English", tgt_lang_value], | |
| value=tgt_lang_value, | |
| label="Transcribe in language:" | |
| ) | |
| # let pnc be anything if src_lang_value == tgt_lang_value, else fix to True | |
| if src_lang_value == tgt_lang_value: | |
| pnc = gr.Checkbox( | |
| value=pnc_value, | |
| label="Punctuation & Capitalization in transcript?", | |
| interactive=True | |
| ) | |
| else: | |
| pnc = gr.Checkbox( | |
| value=True, | |
| label="Punctuation & Capitalization in transcript?", | |
| interactive=False | |
| ) | |
| return src_lang, tgt_lang, pnc | |
| with gr.Blocks( | |
| title="NeMo Canary Model", | |
| css=""" | |
| textarea { font-size: 18px;} | |
| #model_output_text_box span { | |
| font-size: 18px; | |
| font-weight: bold; | |
| } | |
| """, | |
| theme=gr.themes.Default(text_size=gr.themes.sizes.text_lg) # make text slightly bigger (default is text_md ) | |
| ) as demo: | |
| gr.HTML("<h1 style='text-align: center'>NeMo Canary model: Transcribe & Translate audio</h1>") | |
| with gr.Row(): | |
| with gr.Column(): | |
| gr.HTML("<p><b>Step 1:</b> Upload an audio file or record with your microphone.</p>") | |
| audio_file = gr.Audio(sources=["microphone", "upload"], type="filepath") | |
| gr.HTML("<p><b>Step 2:</b> Choose the input and output language.</p>") | |
| src_lang = gr.Dropdown( | |
| choices=["English", "Spanish", "French", "German"], | |
| value="English", | |
| label="Input audio is spoken in:" | |
| ) | |
| with gr.Column(): | |
| tgt_lang = gr.Dropdown( | |
| choices=["English", "Spanish", "French", "German"], | |
| value="English", | |
| label="Transcribe in language:" | |
| ) | |
| pnc = gr.Checkbox( | |
| value=True, | |
| label="Punctuation & Capitalization in transcript?", | |
| ) | |
| with gr.Column(): | |
| gr.HTML("<p><b>Step 3:</b> Run the model.</p>") | |
| go_button = gr.Button( | |
| value="Run model", | |
| variant="primary", # make "primary" so it stands out (default is "secondary") | |
| ) | |
| model_output_text_box = gr.Textbox( | |
| label="Model Output", | |
| elem_id="model_output_text_box", | |
| ) | |
| with gr.Row(): | |
| gr.HTML( | |
| "<p style='text-align: center'>" | |
| "🐤 <a href='#' target='_blank'>Canary model</a> | " | |
| "🧑💻 <a href='https://github.com/NVIDIA/NeMo' target='_blank'>NeMo Repository</a>" | |
| "</p>" | |
| ) | |
| go_button.click( | |
| fn=transcribe, | |
| inputs = [audio_file, src_lang, tgt_lang, pnc], | |
| outputs = [model_output_text_box] | |
| ) | |
| # call on_src_or_tgt_lang_change whenever src_lang or tgt_lang dropdown menus are changed | |
| src_lang.change( | |
| fn=on_src_or_tgt_lang_change, | |
| inputs=[src_lang, tgt_lang, pnc], | |
| outputs=[src_lang, tgt_lang, pnc], | |
| ) | |
| tgt_lang.change( | |
| fn=on_src_or_tgt_lang_change, | |
| inputs=[src_lang, tgt_lang, pnc], | |
| outputs=[src_lang, tgt_lang, pnc], | |
| ) | |
| demo.queue() | |
| demo.launch() |