MIGraphX GraphViz coloring by group improvements

[ethansaurusrex]

Improvement to previous:

• Graphviz output improvements #4101
• Revert "Revert "Graphviz output improvements"" #4128
  and previous issues:
• Improved Graphviz Output #4100

Update MIGraphX Graphviz coloring to use groupings based on aliasing and context free qualities:

• if context free and alias (const foldable: color1)
• if !context free and !alias (reshape: color2)
• if !context free and alias (tbd)
• if context free and !alias (default)

for all other qualities (literals and constants), fallback to current coloring scheme

[ethansaurusrex]

Here are some different ideas:

Original:

1. Changing node color based on groupings:

2. Darkening or dimming the nodes, plus changing node color.

I find the diming is hard to differentiate between the original colors.

Original:

Dimmed version:

3. Using border color to denote grouping:

I think this looks most natural

Border can be adjusted for better visualization as model sizes grow:

[ethansaurusrex]

Other branches:

• Updates fillcolor based on grouping, overwrites attribute: https://github.com/ROCm/AMDMIGraphX/tree/graphviz-dev
• Updates fillcolor based on grouping, does not overwrite attribute: https://github.com/ROCm/AMDMIGraphX/tree/graphviz-dev-keep-color
• Updates fillcolor brightness based on grouping: https://github.com/ROCm/AMDMIGraphX/tree/graphviz-dev-dim

[ethansaurusrex]

Update: #4214

Above is decided branch. In this case we update the coloring based on discussed attributes in addition to pointwise and reduce operations. This will provide us a visual aid in identifying candidate operations for fusion. Note in the below images that we can quickly identify the add and ReLu as possible fusion candidates since they are the same color (both pointwise ops).

Coloring scheme:

if(const_foldable)
{
    color lightblue
}
else if(pointwise)
{
    color yellowgreen
}
else if(reduce) 
{
    color light green
}
else if(context_free and alias)
{
    color palegreen
}
else if(context_free and not alias)
{
    color orange
}
else if(not context_free and alias)
{
    color gold
}
else if(op has fillcolor attribute)
{
    color fillcolor attribute
}
else
{
    color lightgray by default
}

Before:

After: