Descripe the feature and motivation

[ERROR:0@2.968] global onnx_importer.cpp:1054 cv::dnn::dnn4_v20221220::ONNXImporter::handleNode DNN/ONNX: ERROR during processing node with 2 inputs and 1 outputs: [Einsum]:(onnx_node!Einsum_155) from domain='ai.onnx

Additional context

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