How to train regression model with multiple dataset

The datasets I am working with correspond to individual time series signals. Each signal is unique, with differing total number of data points. here I want to simulate dataset A using dataset B.

Dataset A :

[1.16630985]
(15000, 1)

Dataset B :

[ 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0.
0. 0. 0. 0. 4. 0. 2. 0. 5. 8. 3. 2. 0. 0.
1. 26. 83. 98. 70. 6. 4. 0. 0. …

dataset deeplearning regression