human
I am working on the file "ML_SS2017/tf_logistic_equation.ipynb".
The first task is:
tf.while_loop
Can you write Python code for it?
 Give me a the Python code you requested?
assistant
#Here is the Python code you requested.

with tf.device('/gpu:0'):
    X = tf.Variable(x)
    A = tf.constant(a)

    def c(i,x):
        return  tf.less(i, 1000) 

    def b(i,x):
        x = A*x*(1-x)
        return tf.add(i, 1),x

    r = tf.while_loop(c, b, (tf.constant(0),X))

init_op = tf.global_variables_initializer()
with tf.Session(config=config) as sess:
    sess.run(init_op)
    %time iterations,x = sess.run(r)