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README.md
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---
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datasets:
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- PASCAL-VOC
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language:
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- en
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metrics:
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- mAP
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library_name: pytorch
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pipeline_tag: object-detection
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tags:
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- faster-rcnn
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- object-detection
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- pytorch
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- computer-vision
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- from-scratch
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- paper-implementation
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results:
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- Metric Result
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- mAP@0.5 63%
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- RPN Recall @ IoU 0.5 - 83%
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Known_Deviations(expected affect on mAP):
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-ResNet-50 instead of ResNet-101 due to compute constraint resulting weaker features than ResNet-101, likely costing several mAP points — probably felt most on small/textured classes like `bottle`/`pottedplant`, this project's weakest. Not isolated by a ResNet-101 run.
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-Batch size 2 instead of 1, GPU throughput, Paper's lr schedule (per-image, batch size 1) reused unscaled, changing gradient noise per step. Not isolated.
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-No horizontal flip augmentation, not implemented, Paper's VOC recipe uses flipping as a free 2× augmentation; skipping it likely costs some mAP, more on sparser classes. Not isolated.
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-BatchNorm frozen from Step 2 onward, Batch size 2 is too small for stable BN statistics — standard practice, not ad hoc, Expected neutral-to-beneficial vs. unfrozen (paper's VGG16 has no BN to compare against). Step 1 is the exception — its backbone trains with BN unfrozen.
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