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rebase on "fx quant: do not insert observers at quantized inputs"
Summary: Context: the existing implementation of `quantized_input_idxs` is convert-only. Therefore, observers are inserted between the input and the first quantized node. This is a problem during QAT, because the initial input is a fake_quant, and it starts with scale=1 and zp=0. This does not match the quantization parameters of the graph input, which can lead to incorrect numerics. Fix: do not insert observer for a quantized input. Test Plan: ``` python test/test_quantization.py TestQuantizeFx ``` Reviewers: Subscribers: Tasks: Tags: Differential Revision: [D25499486](https://our.internmc.facebook.com/intern/diff/D25499486) [ghstack-poisoned]
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