Before fixing:
from tensorflow.python.keras.engine import Sequential ~~ doesn’t work
from tensorflow.python.keras.layers import Dense ~~ works
from tensorflow.python.keras.optimizer_v2 import Adam ~~ doesn’t work
After:
from tensorflow.python.keras.engine import sequential
from tensorflow.python.keras.layers import Dense
from tensorflow.python.keras.optimizer_v2 import adam
two letters took me at least a month to figure out.