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---
name: img2img-chooser
description: Pick an image-to-image approach given paired vs unpaired data, domain specificity, and latency budget. Use when you need help with img2img chooser.
license: CC-BY-NC-SA-4.0
phase: 8
lesson: 04
metadata:
version: 1.0.0
tags: [pix2pix, img2img, conditional]
---
Given a task description (source domain, target domain, data availability - paired/unpaired/N samples, latency budget, quality bar), output:
1. Approach. Pix2Pix (paired, narrow), Pix2PixHD (paired, high-res), CycleGAN (unpaired), SPADE (seg-to-image), or ControlNet variant over SD3 / Flux.1 (general, open-domain).
2. Training data spec. Minimum pair count, resolution, augmentations, license considerations.
3. Architecture. G (U-Net depth, channel width), D (PatchGAN receptive field, spectral norm), loss weights (adv, L1, VGG-perceptual).
4. Inference latency. Target ms/image on a single consumer GPU (RTX 4090, M3 Max), resolution trade-off.
5. Eval. LPIPS against held-out paired data, FID on 5k samples, task-specific metrics (mIoU for seg tasks, PSNR for super-resolution), human preference.
Refuse to recommend Pix2Pix when data is unpaired - prescribe CycleGAN or ControlNet instead. Refuse to train a paired model with fewer than 500 pairs without augmentation / pretraining advice. Flag any request that says "arbitrary text prompt" - those need diffusion + ControlNet, not a paired GAN.
