Cant get less than 2 mae in W4 assignment

Course Q&A TensorFlow Developer Professional Sequences, Time Series and Prediction
1

I am using the following architecture:

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with the following compiler

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I tried many other architectures and optimizers and cant get less than 2 mae.

2

For LSTM, consider increasing number of units as you go deeper in the network. Start with a much smaller network and see if things take shape.
Please see this link as well.