my alpha parameter has no effect, and I cant figure out, what the problem is. My code:

%matplotlib notebook
def evaluation_plt(x, y, final_theta):
    ''' Plots the data x, y together with the final model
    
    Args:
        x: numpy arrays, x values from the data set
        y: vector, y values from the data set
        final_theta: numpy array
    '''
    #raise NotImplementedError("You should implement this!")

    fig = plt.figure()

    sub_plt = fig.add_subplot(111, projection="3d")
    sub_plt.scatter(x[:,0],x[:,1],y,c=y,cmap='viridis')

    X,Y = np.meshgrid(x,y)
    Z = final_theta[0] + final_theta[1]*X + final_theta[2]*Y

    sub_plt_data.plot_surface(X,Y,Z, alpha=0.5, cmap='inferno')
    plt.show()

But the plot looks like this:
Plot

I did try to use inline plot but the problem is the perspective, its not good for the plot because you cant see anything because all the datapoints are in 1 line