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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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-
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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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-
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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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- ---