make peft installs a extra_dep

setup.py

@@ -62,10 +62,6 @@
     'cmake>=3.25.0,<=3.26.3',  # required for triton-pre-mlir below
     # PyPI does not support direct dependencies, so we remove this line before uploading from PyPI
     'triton-pre-mlir@git+https://github.com/vchiley/triton.git@triton_pre_mlir_sm90#subdirectory=python',
-    'loralib==0.1.1',  # lora core
-    'peft @ git+https://github.com/huggingface/peft.git',  # TODO: pin it down only after it stabilizes.
-    'bitsandbytes==0.39.1',  # 8bit
-    'scipy>=1.10.0,<=1.11.0',  # bitsandbytes dependency; TODO: eliminate when incorporated to bitsandbytes
 ]
 
 extra_deps = {}
@@ -90,6 +86,13 @@
     'xentropy-cuda-lib@git+https://github.com/HazyResearch/[email protected]#subdirectory=csrc/xentropy',
 ]
 
+extra_deps['peft'] = [
+    'loralib==0.1.1',  # lora core
+    'peft @ git+https://github.com/huggingface/peft.git',  # TODO: pin it down only after it stabilizes.
+    'bitsandbytes==0.39.1',  # 8bit
+    'scipy>=1.10.0,<=1.11.0',  # bitsandbytes dependency; TODO: eliminate when incorporated to bitsandbytes
+]
+
 extra_deps['all'] = set(dep for deps in extra_deps.values() for dep in deps)
 
 setup(