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Update on "fix embedding_backward_dense decomp with broadcasting"
Fixes #95182 cc soumith voznesenskym yanboliang penguinwu anijain2305 EikanWang jgong5 Guobing-Chen XiaobingSuper zhuhaozhe blzheng Xia-Weiwen wenzhe-nrv jiayisunx desertfire ngimel for another decomp fix. For this one, I tried auditing the CPU and CUDA kernels for `embedding_backward_dense` and just could not figure out where the `unsqueeze(1)` was supposed to be coming from. In the failing example, our tensor shapes are `(2, 4, 3)` and `(2, 4)`, and so I just assumed that the existing decomp had a typo - we should be unsqueezing the last dim, instead of dim index 1. That fixes the repro, and the existing decomp + meta tests appear to be passing. cc soumith voznesenskym yanboliang penguinwu anijain2305 EikanWang jgong5 Guobing-Chen XiaobingSuper zhuhaozhe blzheng Xia-Weiwen wenzhe-nrv jiayisunx desertfire [ghstack-poisoned]
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