Error when running 03. stock notebook

[jwbrown]

I am getting
NotImplementedError: Cannot convert a symbolic Tensor (bidirectional/forward_cu_dnnlstm/strided_slice:0) to a numpy array. This error may indicate that you're trying to pass a Tensor to a NumPy call, which is not supported

for
model.add(Bidirectional(CuDNNLSTM(WINDOW_SIZE, return_sequences=True),
input_shape=(WINDOW_SIZE, X_train.shape[-1])))

I am running Tensorflow 2.4.0rc0 and numpy 1.21.4

i saw somewhere the moving back to numpy==1.19.5 could resolve it, but it did not have an impact

Can you advise the best direction here?