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Hello.

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Welcome back.

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In this lesson we should talk a bit more about life as a unit.

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Let's examine this for Lee a new network this new network takes three input layer one has five units

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the two has five units the three has three unit and therefore has one unit.

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We often denote the number of layers of a neural network with a capital L number of units in a layer

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is denoted by N superscript square brackets L where l denote delay a number so that in our current neural

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network and superscript 1 is equal to 5 and and superscript 3 is equal to 5.

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And so on and so forth we denote activation in layer l by a superscript square bracket l mean that the

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input layer is sometimes referred to us layer a superscript 0 and the outputs layer which is the same

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as Y heart is sometimes denoted as a superscript copy to l.

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Now let's talk a bit more about the shapes.