>>> from xam import latex # Has to be imported before matplotlib.pyplot
>>> import numpy as np
>>> fig, ax = latex.new_fig(width=0.8)
>>> x = np.arange(-2, 2, 0.03)
>>> y1 = 1 / (1 + np.exp(-x))
>>> y2 = np.tanh(x)
>>> y3 = np.arctan(x)
>>> y4 = x * (x > 0)
>>> plot = ax.plot(x, y1, label='Logistic sigmoid')
>>> plot = ax.plot(x, y2, label='Hyperbolic tangent')
>>> plot = ax.plot(x, y3, label='Inverse tangent')
>>> plot = ax.plot(x, y4, label='Rectified linear unit (ReLU)')
>>> x_label = ax.set_xlabel(r'$x$')
>>> y_label = ax.set_ylabel(r'$y$')
>>> title = ax.set_title('A few common activation functions')
>>> ax.grid(linewidth=0.5)
>>> legend = ax.legend(loc='upper left', framealpha=1)
latex.save_fig('figures/latex_example')