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W needs to be a 27x27 matrix, not 27x1. This typo can trip people up, specially beginners. Since xenc is 5x27, only when W is 27x27, will you get a 5x27 matrix for xenc@W, like you see subsequently in this notebook. Even in the video you'll see that this was 27x27 initially but switches to 27x1 after an editing cut (presumably something was Cmd+Z'd in between): https://youtu.be/PaCmpygFfXo?t=4681
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W needs to be a 27x27 matrix, not 27x1. This typo can trip people up, specially beginners.
Since xenc is 5x27, only when W is 27x27, will you get a 5x27 matrix for xenc@W, like you see subsequently in this notebook.
Even in the video you'll see that this was 27x27 initially but switches to 27x1 after an editing cut (presumably something was Cmd+Z'd in between): https://youtu.be/PaCmpygFfXo?t=4681