Below is a sample of darts time series model. How can I save this model to onnx model? Is there any way to do it? Thank you.
import pandas as pd
import numpy as np
import darts
from darts import TimeSeries
from darts.models import NBEATSModel
#df dataset
date = pd.date_range(start = '01/01/2018', end = '12/29/2021', freq = 'D')
sales=np.random.rand(len(date))
df=pd.DataFrame({'sales': sales}, index=date)
df.index.name='Date'
df.reset_index(level=0, inplace=True)
#convert time series
df=TimeSeries.from_dataframe(df,time_col='Date',value_cols=['sales'])
#model
model = NBEATSModel(input_chunk_length=24, output_chunk_length=12, n_epochs=100,
random_state=0)
model.fit(df)