pytorch

6a568779 - [quant][pt2e][improvement] Remove the need to annotate all nodes with default annotation (#99001)

[quant][pt2e][improvement] Remove the need to annotate all nodes with default annotation (#99001) Summary: This PR changes prepare to use some default observer/fq constructor when "target_dtype_info" is not set, this allows user to not initialize all nodes to default observer/fq constructor. Note we may still need to annotate intermediate node after this PR, there will be a follow up PR to allow users to only annotate things they want to quantize Test Plan: python test/test_quantization.py TestQuantizePT2E python test/test_quantization.py TestQuantizePT2EModels Reviewers: Subscribers: Tasks: Tags: Pull Request resolved: https://github.com/pytorch/pytorch/pull/99001 Approved by: https://github.com/kimishpatel, https://github.com/andrewor14