First commit

fig/replaced_by_d3/README.md

@@ -0,0 +1,6 @@
+# Replaced by d3 directory
+
+This directory contains python code which generated png figures which
+were later replaced by d3 in the live version of the site.  They've
+been preserved here on the off chance that they may be of use at some
+point in the future.

fig/replaced_by_d3/relu.py

@@ -0,0 +1,24 @@
+"""
+relu
+~~~~
+
+Plots a graph of the squashing function used by a rectified linear
+unit."""
+
+import numpy as np
+import matplotlib.pyplot as plt
+
+z = np.arange(-2, 2, .1)
+zero = np.zeros(len(z))
+y = np.max([zero, z], axis=0)
+
+fig = plt.figure()
+ax = fig.add_subplot(111)
+ax.plot(z, y)
+ax.set_ylim([-2.0, 2.0])
+ax.set_xlim([-2.0, 2.0])
+ax.grid(True)
+ax.set_xlabel('z')
+ax.set_title('Rectified linear unit')
+
+plt.show()

fig/replaced_by_d3/sigmoid.py

@@ -0,0 +1,23 @@
+"""
+sigmoid
+~~~~~~~
+
+Plots a graph of the sigmoid function."""
+
+import numpy
+import matplotlib.pyplot as plt
+
+z = numpy.arange(-5, 5, .1)
+sigma_fn = numpy.vectorize(lambda z: 1/(1+numpy.exp(-z)))
+sigma = sigma_fn(z)
+
+fig = plt.figure()
+ax = fig.add_subplot(111)
+ax.plot(z, sigma)
+ax.set_ylim([-0.5, 1.5])
+ax.set_xlim([-5,5])
+ax.grid(True)
+ax.set_xlabel('z')
+ax.set_title('sigmoid function')
+
+plt.show()

fig/replaced_by_d3/step.py

@@ -0,0 +1,23 @@
+"""
+step
+~~~~~~~
+
+Plots a graph of a step function."""
+
+import numpy
+import matplotlib.pyplot as plt
+
+z = numpy.arange(-5, 5, .02)
+step_fn = numpy.vectorize(lambda z: 1.0 if z >= 0.0 else 0.0)
+step = step_fn(z)
+
+fig = plt.figure()
+ax = fig.add_subplot(111)
+ax.plot(z, step)
+ax.set_ylim([-0.5, 1.5])
+ax.set_xlim([-5,5])
+ax.grid(True)
+ax.set_xlabel('z')
+ax.set_title('step function')
+
+plt.show()

fig/replaced_by_d3/tanh.py

@@ -0,0 +1,22 @@
+"""
+tanh
+~~~~
+
+Plots a graph of the tanh function."""
+
+import numpy as np
+import matplotlib.pyplot as plt
+
+z = np.arange(-5, 5, .1)
+t = np.tanh(z)
+
+fig = plt.figure()
+ax = fig.add_subplot(111)
+ax.plot(z, t)
+ax.set_ylim([-1.0, 1.0])
+ax.set_xlim([-5,5])
+ax.grid(True)
+ax.set_xlabel('z')
+ax.set_title('tanh function')
+
+plt.show()