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Preprocesses predictor data (x) into a format suitable for Keras models. Handles both tabular data and list-columns of arrays (e.g., for images).
x
process_x_sequential(x)
A list containing:
x_proc: The processed predictor data (matrix or array).
x_proc
input_shape: The determined input shape for the Keras model.
input_shape
A data frame or matrix of predictors.