Grade error. MAE and MSE is more than what I got

Here are steps to refresh the workspace and get the starter code.
WINDOW_SIZE given in the starter code can be left unchanged. LSTMs can deal with sequences of length 64.
Your approach towards BATCH_SIZE is along the right direction.

See this topic to understand how the scale of training data influences model training.

There are a few ungraded labs for course 4 week 4. Here are the links:

  1. Lab 1
  2. Labs 2 & 3