fix: bump torch 2.6->2.10 + cu128, constrain transformers<5.5 to dodge torchao regression

space/training/requirements.txt

@@ -1,24 +1,31 @@
---extra-index-url https://download.pytorch.org/whl/cu124
-# Strategy: pin only torch (so we get the right CUDA wheel) and unsloth (which
-# locks the rest of the matrix — trl, transformers, peft, etc — transitively
-# via its package metadata). We avoid hand-pinning the surrounding libraries
-# because hand-pins kept producing import-time syntax errors from skew.
-torch==2.6.0
-torchvision==0.21.0
-torchaudio==2.6.0
-unsloth==2026.4.8
-# Pin transformers to 4.x: the 5.x series dropped many legacy model classes
-# (e.g. BloomPreTrainedModel) that current peft / trl still reference, which
-# broke imports at runtime.
-transformers>=4.51.3,<5.0
-trl>=0.18.2,<=0.24.0,!=0.19.0
-peft>=0.18.0,<0.20
-xformers
-matplotlib>=3.8.0
-numpy>=1.24.0
-scipy>=1.10.0
-pydantic>=2.0.0
-fastapi>=0.110.0
-uvicorn>=0.27.0
-huggingface_hub>=0.24.0
-git+https://github.com/meta-pytorch/OpenEnv.git
+--extra-index-url https://download.pytorch.org/whl/cu128
+# Strategy: pin to Unsloth 2026.4.8's officially supported A100/Ampere matrix
+# `cu128-ampere-torch2100`. Earlier we tried torch 2.6.0 + cu124, which pulled
+# transformers 5.5 → torchao 0.17 → `torch.utils._pytree.register_constant`,
+# a torch 2.7+ symbol → AttributeError at import. Bumping torch to 2.10.0
+# (highest within Unsloth's `<2.11.0` cap) keeps every transitive happy.
+torch==2.10.0
+torchvision==0.25.0
+torchaudio==2.10.0
+unsloth==2026.4.8
+unsloth_zoo>=2026.4.8
+# Bound transformers to <5.5 to skip a known torchao-integration regression on
+# 5.5.x while staying inside Unsloth's allow-list (>=4.51.3 with the explicit
+# version exclusions Unsloth declares in its requires_dist).
+transformers>=4.51.3,<5.5,!=4.52.0,!=4.52.1,!=4.52.2,!=4.52.3,!=4.53.0,!=4.54.0,!=4.55.0,!=4.55.1,!=4.57.0,!=4.57.4,!=4.57.5
+trl>=0.18.2,<=0.24.0,!=0.19.0
+peft>=0.18.0,!=0.11.0
+accelerate>=0.34.1
+datasets>=3.4.1,<4.4.0,!=4.0.*,!=4.1.0
+bitsandbytes>=0.45.5,!=0.46.0,!=0.48.0
+xformers==0.0.34
+matplotlib>=3.8.0
+
+# Space control panel + env API deps
+numpy>=1.24.0
+scipy>=1.10.0
+pydantic>=2.0.0
+fastapi>=0.110.0
+uvicorn>=0.27.0
+huggingface_hub>=0.24.0
+openenv-core[core]>=0.2.3