ESPnet JETS Text-to-Speech (TTS) Model for ONNX

imdanboy/jets exported to ONNX. This model is an ONNX export using the espnet_onnx library.

Usage with txtai

txtai has a built in Text to Speech (TTS) pipeline that makes using this model easy.
import soundfile as sf
from txtai.pipeline import TextToSpeech
# Build pipeline
tts = TextToSpeech("NeuML/ljspeech-jets-onnx")
# Generate speech
speech = tts("Say something here")
# Write to file
sf.write("out.wav", speech, 22050)

Usage with ONNX

This model can also be run directly with ONNX provided the input text is tokenized. Tokenization can be done with ttstokenizer.
Note that the txtai pipeline has additional functionality such as batching large inputs together that would need to be duplicated with this method.
import onnxruntime
import soundfile as sf
import yaml
from ttstokenizer import TTSTokenizer
# This example assumes the files have been downloaded locally
with open("ljspeech-jets-onnx/config.yaml", "r", encoding="utf-8") as f:
config = yaml.safe_load(f)
# Create model
model = onnxruntime.InferenceSession(
# Create tokenizer
tokenizer = TTSTokenizer(config["token"]["list"])
# Tokenize inputs
inputs = tokenizer("Say something here")
# Generate speech
outputs =, {"text": inputs})
# Write to file
sf.write("out.wav", outputs[0], 22050)

How to export

More information on how to export ESPnet models to ONNX can be found here.


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