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Support matching variadic inputs #2373

@JoanYu

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@JoanYu

I have a ONNX model graph: multi-input -> concat -> transpose, for a better performance for some target device, we need to swap transpose and concat, now the new graph will be multi x (input-> transpose) -> concat (the axis will change), so I wrote a code based on onnxscript.rewriter.pattern

def pattern(op, shape, *seq):
    x = op.Concat(*seq, axis=1)
    x = op.Transpose(x, perm=[0,1,3,2])
    return op.Reshape(x, shape)

def rewrite(op, shape, *seq: Sequence[ValuePattern]):
    print(seq)
    x = op.Concat(seq, axis=3)
    return op.Transpose(x, perm=[0,3,1,2])

but seq will be considered as one input while converted to _pattern_ir._target_pattern

the number of inputs will be dynamic, it seemed to be the RewriteRule class not support the feature now.

BRs, Joan.

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