DimError when generating the circuit settings

[mmagician]

Describe the bug

Related to model 2 from #670.

I'm failing to generate the settings json with the following command:
ezkl gen-settings -M network.onnx --variables sequence_length=1,batch_size=1

Getting a DimError, though I am not able to see any further info on what the cause is.
With this new PR I get a little more info:

[E] [2023-12-30 18:49:16, ezkl::graph::model] - dimensionality error when manipulating a tensor: The current dimension 512 must be contained in the new shape [1, 1, 1] or be 1
[E] [2023-12-30 18:49:16, ezkl] - failed: General synthesis error

Expected behaviors

Steps to reproduce the bug

1. Run ...
2. Execute ...

Device and Operating System

OS: MacOS
Version: Ventura 13.3.1
Processor: Apple M1
Memory: 16 GB

Additional Information

[alexander-camuto]

@mmagician you need to add the variables --variables sequence_length=1,batch_size=1 to the end of the command as noted in #670

[mmagician]

The command I ran actually includes that, sorry @alexander-camuto the original comment didn't mention the right command, edited now.
So the issue still stands.

[mmagician]

@alexander-camuto ping to re-open the issue as per the above comment.

[alexander-camuto]

reopened and patched @mmagician