feat: hypervector string representations

[MichielStock]

A work in progress, trying some visuals. Might be overkill

julia> RealHV()
10000-element RealHV{Float64}
mean ± std : -0.002761564701655029 ± 1.000573790171685
    ┌                                        ┐ 
      ╷            ┌──┬──┐                 ╷   
      ├────────────┤  │  ├─────────────────┤   
      ╵            └──┴──┘                 ╵   
    └                                        ┘ 
     -4                0.5                  5  
       ┌────────────────────────┐  5  
   100 │▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄│ ┌──┐
       │▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄│ │▄▄│
       │▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄│ │▄▄│
       │▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄│ │▄▄│
       │▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄│ │▄▄│
       │▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄│ │▄▄│
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       │▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄│ │▄▄│
       │▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄│ │▄▄│
       │▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄│ │▄▄│
       │▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄│ │▄▄│
     1 │▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄│ └──┘
       └────────────────────────┘ -4  
        1                    100      

[cvigilv]

I would provide this as a package extension, as I don't think it makes sense to have this representations as default. I much prefer something along the lines of:

RealHV(mean: 0.0+-0.1, extrema: [-1.0, 1.6], dims: 10.000)

[cvigilv]

Package extension page: https://pkgdocs.julialang.org/v1/creating-packages/#Conditional-loading-of-code-in-packages-(Extensions)

[MichielStock]

I split the code into a pkg extension. It works.

Should anything else be added? A plotting recipe (maybe not a priority)

[cvigilv]

I don't think so, I would format this (I can do it manually form this PR) and merge it. I would push forward with #28

[cvigilv]

Could you put here an example of the string representations? Ideally on alone and one of hypervectors in an array, e.g.:

julia> BinaryHV()

julia> [BinaryHV() for _ in 1:5]

Just to see how this look, since structures have 2 types of string representations.

[MichielStock]

julia> BinaryHV()
10000-element BinaryHV
1 / 0 : 4991 / 5009
         ┌                                        ┐ 
   false ┤■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ 5 009   
    true ┤■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ 4 991   
         └                                        ┘ 
       ┌────────────────────────┐ t rue 
   100 │▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄│ ┌──┐  
       │▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄│ │▄▄│  
       │▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄│ │▄▄│  
       │▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄│ │▄▄│  
       │▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄│ │▄▄│  
       │▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄│ │▄▄│  
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       │▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄│ │▄▄│  
       │▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄│ │▄▄│  
       │▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄│ │▄▄│  
     1 │▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄│ └──┘  
       └────────────────────────┘fa lse 
        1                    100        


julia> [BinaryHV()]
1-element Vector{BinaryHV}:
 10000-element BinaryHV
mean ± std : 0.503 ± 0.5

When UnicodePlots is not loaded, the matrices do not appear.

[cvigilv]

Ok, by convention the "short" string representation should be 1 line high in order to not break vector/matrix visualization. I would just remove the newline between the '10000-element HV' and 'mean +- std...'.

[MichielStock]

This should be fine:

julia> [RealHV(), RealHV(), RealHV()]
3-element Vector{RealHV{Float64}}:
 10000-element RealHV{Float64} - m ± sd: 0.0 ± 1.0
 10000-element RealHV{Float64} - m ± sd: 0.0 ± 1.0
 10000-element RealHV{Float64} - m ± sd: 0.0 ± 1.0

[cvigilv]

LGTM, we can merge this if you feel is done