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sam3.1_multiplex.pt has zero build_* path that loads cleanly on public main (2026-04-20 install)

Status: Open.

#526 In facebookresearch/sam3;

· navin1976 opened on Apr 20, 2026

decoder.py forces exclusive SDPBackend.FLASH_ATTENTION, crashes on platforms without Flash Attention

Status: Open.

#523 In facebookresearch/sam3;

· cjkindel opened on Apr 16, 2026

Sam 3.1 Transformers library support

Status: Open.

#521 In facebookresearch/sam3;

· nichwyl opened on Apr 15, 2026

SAM3.1 - Suggestion installation guide 3.1

Status: Open.

#517 In facebookresearch/sam3;

· Joeycho opened on Apr 10, 2026

[HELP] Is it possible to fine tune with no text prompt?

Status: Open.

#515 In facebookresearch/sam3;

· MysteriousShadow opened on Apr 10, 2026

Restore Original SAM3 Huggingface Space & Document Updates

Status: Open.

#514 In facebookresearch/sam3;

· zhaohengyin opened on Apr 9, 2026

[Help] Need suggestion regarding SAM3 Speed Optimization under 100ms per frame

Status: Open.

#513 In facebookresearch/sam3;

· ganeshmohane-aisolo opened on Apr 8, 2026

Questions about addmm_act function.

Status: Open.

#509 In facebookresearch/sam3;

· ksaito-ut opened on Apr 1, 2026

RuntimeError: mat1 and mat2 must have the same dtype, but got BFloat16 and Float during image inference

Status: Open.

#507 In facebookresearch/sam3;

· Lrogic opened on Mar 31, 2026

Checkpoint key mismatch when loading pretrained SAM3.1 weights

Status: Open.

#506 In facebookresearch/sam3;

· jingjing0419 opened on Mar 30, 2026

Evaluation for CountBench

Status: Open.

#505 In facebookresearch/sam3;

· xiaofochai-cyber opened on Mar 30, 2026

TypeError: expected str, bytes or os.PathLike object, not NoneType

Status: Open.

#504 In facebookresearch/sam3;

· syafiqmuda opened on Mar 28, 2026