v0.3.0 — SAM 2.1 Migration

What's New

SAM 2.1 Migration

• Migrated from segment-anything (SAM 1) to sam2 (SAM 2.1) across the entire codebase
• SAM 2.1 checkpoint: sam2.1_hiera_large.pt (~900MB, down from ~2.4GB)
• All notebooks, core library, docs, and dependencies updated

Cross-Platform GPU Support

• Automatic device detection (CUDA / MPS / CPU) for all build_sam2() calls
• macOS Apple Silicon: TensorFlow via Metal + PyTorch via MPS in the same environment
• Pinned tensorflow<=2.18.1 for tensorflow-metal compatibility

Breaking Changes

• Python ≥3.10 required (SAM 2 dependency)
• segment-anything replaced by sam2 — update your imports:

  # Old (v0.2.x)
  from segment_anything import sam_model_registry, SamPredictor
  
  # New (v0.3.0)
  from sam2.build_sam import build_sam2
  from sam2.sam2_image_predictor import SAM2ImagePredictor

• SAM checkpoint changed: download sam2.1_hiera_large.pt from here