Convert pandas series into numpy array

Try this:
after applying the .as_matrix on your series object

Y.reshape((2,1))

Since .as_matrix() only returns a numpy-array NOT a numpy-matrix. Link here

If df is your dataframe, then a column of the dataframe is a series and to convert it into an array,

df = pd.DataFrame()
x = df.values
print(x.type)

The following prints,

<class 'numpy.ndarray'>

successfully converting it to an array.

To get numpy array, you need

Y.values

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