Error in Figure 4.7 (Page 27) Description?

[ShikharJ]

Thanks guys for this amazing report, it helped me a lot in understanding convolutional arithmetic.

I think I found a slight error in the description of the figure 4.7 description on page 27 (line 3). Straight from the report:

The transpose of convolving a $3 \times 3$ kernel over a $6 \times 6$ input padded with a $1 \times 1$ border of zeros using $2 \times 2$ strides (i.e., $i = 6$, $k = 3$, $s = 2$ and $p = 1$). It is equivalent to convolving a $3 \times 3$ kernel over a 2 \times 2 input (with $1$ zero inserted between inputs) padded with a $1 \times 1$ border of zeros (with an additional border of size $1$ added to the bottom and right edges) using unit strides (i.e., $i' = 3$, $\tilde{i}' = 5$, $a = 1$, $k' = k$, $s' = 1$ and $p' = 1$).

Shouldn't this be 3 \times 3 ? The visual is probably correct, this feels erroneous, and can be seen by calculating directly from the formula of the direct convolution.

[jianchao-li]

Just found the same mistake as did @ShikharJ. It appeared in the caption of Figure 4.7 on Page 27, shown below.

The text with a red underline should be 3 x 3 input.

[fvisin]

Thank you for reporting this typo. It should indeed read 3 x 3 input, we will fix it along with the rest in the next update to the guide.

Thank you again for reporting it.