Crypto Encryption Intro to public key

What’s the side of the keyspace for the substitution cipher?

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Consider the weight update: Which of these is a correct vectorized implementation?

Suppose q is at a local minimum of a function Suppose q is at a local minimum of a function. What will one iteration of gradient descent do? Leave q unchanged. Change q in a random direction. Move q towards the global minimum of J(q). Decrease q.

Fig. A corresponds to a=0.01, Fig. B to a=0.1, Fig. C to a=1.