LPAI—A Complete AIoT Framework Based on LPWAN Applicable to Acoustic Scene Classification Scenarios

. 2022 Dec 2;22(23):9404. doi: 10.3390/s22239404

Algorithm 1 Cloud-Based Retraining Algorithm

1:
Given a classification task with C categories.
Input:
Source features $f_{s_{i}}$ and some uploaded features $f_{t_{i}}$ .
2:
Perform data augmentation on $f_{t_{i}}$ and obtain $f_{n e w_t_{i}}$ . Use a portion of $f_{s_{i}}$ and $f_{n e w_t_{i}}$ as the training set $X_{r e t r a i n}$ to train a teacher model.
3:
for each epoch do
3:
Obtain samples $x_{t}$ with a confidence level higher than $γ_{s e r v e r}$ .
3:
Calculate the coral loss $L_{D A}$ .
3:
Calculate the total loss in Equation (8).
4:
end for
5:
Output: A new Teacher model $M_{s}$ .