TypeError: only size-1 arrays can be converted to Python scalars

I am training a CNN model for facial recognition using Google Colab. I am facing issue with python list function i.e. array(). Everything was fine when the list had 28000 instances. I increased the samples and list size increased to 170000. After increasing list size, it gives the following error. Thanks

Here is the code sample;

x_train = np.array(x_train, 'float32')
x_test = np.array(x_test, 'float32')
y_train = np.array(y_train, 'float32')
y_test = np.array(y_test, 'float32')

TypeError: only size-1 arrays can be converted to Python scalars

The above exception was the direct cause of the following exception:

ValueError
in ()
ValueError: setting an array element with a sequence.

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Author: Mansoor Alam