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Update andrewng-p-1-neural-network-deep-learning.md #4

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5 changes: 3 additions & 2 deletions andrewng-p-1-neural-network-deep-learning.md
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Expand Up @@ -612,8 +612,9 @@ Here are the course summary as its given on the course [link](https://www.course
### Getting your matrix dimensions right

- The best way to debug your matrices dimensions is by a pencil and paper.
- Dimension of `W` is `(n[l],n[l-1])` . Can be thought by right to left.
- Dimension of `b` is `(n[l],1)`
- Dimension of `W[l]` is `(n[l],n[l-1])` . Can be thought by right to left.
- Dimension of `b[l]` is `(n[l],1)`
- l=layer, n= number of nodes in a layer 'l'
- `dw` has the same shape as `W`, while `db` is the same shape as `b`
- Dimension of `Z[l],` `A[l]`, `dZ[l]`, and `dA[l]` is `(n[l],m)`

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