Help with tmap in Interlude V

[brrgrl]

Up to Interlude V, I have been getting by with just having (require malt) provide all the tools that I need while building along with the book. However, when I got to using tmap it was undefined.

My first few passes through the repo, it looks like it's not defined in flat-tensors but it is defined in nested-tensors.

So I'm a little lost.

Defining tmap with (define tmap vector-map) and then trying the example leads to

> (tmap add1 (tensor 3 4 5))
. . add1: contract violation
  expected: number?
  given: #<procedure:flat>
> 

Instead requiring nested tensors (require malt/nested-tensors) I get something that works

> (require malt/nested-tensors)
> (tmap add1 (tensor 3 4 5))
#(4 5 6)
> 

[themetaschemer]

Hi Brrgrl, For Interlude V, you have to do: `(require malt/interlude-V)` This is also mentioned in the chapter guide on the website, but perhaps we have been remiss in making it more prominent.  The default implementation of flat-tensors implements ext1 and ext2 differently, so we have provided a separate module to allow you to experiment with the code in Interlude V.

[brrgrl]

Follow up: when going through the rest of interlude-V, it looks like flatten-2 should be provided but in no-overrides.rkt it isn't.
Is this the case?

[themetaschemer]

Hmm ... that might be a bug. Let me investigate.

[themetaschemer]

Okay, I have fixed and pushed. Thank you for pointing it out.

[brrgrl]

Thank you!

I found a dot-product defined in G-correlate but I'm not sure if that's the one that is referenced by frame 43 in interlude-V.

Should the dot-product from malted with the d-sum substitution be included?

(define d-dot-product
  (λ (w t)
   (d-sum
     (* w t))))

[themetaschemer]

Brrgrl, sorry you're having so many issues with this. Yes, that definition will work. But I am also updating interlude-V to include a dot-product-1-1 explicitly. Please pull the latest.