Add a CPU-only build option

2 files changed, 13 insertions, 9 deletions

diff --git a/bitsandbytes/optim/__init__.py b/bitsandbytes/optim/__init__.py
index 5e73414..e833ecc 100644
--- a/bitsandbytes/optim/__init__.py
+++ b/bitsandbytes/optim/__init__.py
@@ -2,11 +2,15 @@
 #   
 # This source code is licensed under the MIT license found in the 
 # LICENSE file in the root directory of this source tree.
-from .adam import Adam, Adam8bit, Adam32bit
-from .adamw import AdamW, AdamW8bit, AdamW32bit
-from .sgd import SGD, SGD8bit, SGD32bit
-from .lars import LARS, LARS8bit, LARS32bit, PytorchLARS
-from .lamb import LAMB, LAMB8bit, LAMB32bit
-from .rmsprop import RMSprop, RMSprop8bit, RMSprop32bit
-from .adagrad import Adagrad, Adagrad8bit, Adagrad32bit
-from .optimizer import GlobalOptimManager
+
+from bitsandbytes.cextension import COMPILED_WITH_CUDA
+
+if COMPILED_WITH_CUDA:
+    from .adam import Adam, Adam8bit, Adam32bit
+    from .adamw import AdamW, AdamW8bit, AdamW32bit
+    from .sgd import SGD, SGD8bit, SGD32bit
+    from .lars import LARS, LARS8bit, LARS32bit, PytorchLARS
+    from .lamb import LAMB, LAMB8bit, LAMB32bit
+    from .rmsprop import RMSprop, RMSprop8bit, RMSprop32bit
+    from .adagrad import Adagrad, Adagrad8bit, Adagrad32bit
+    from .optimizer import GlobalOptimManager
diff --git a/bitsandbytes/optim/rmsprop.py b/bitsandbytes/optim/rmsprop.py
index 7909d5d..0f1ffaa 100644
--- a/bitsandbytes/optim/rmsprop.py
+++ b/bitsandbytes/optim/rmsprop.py
@@ -31,6 +31,6 @@ class RMSprop32bit(Optimizer1State):
         if alpha == 0:
             raise NotImplementedError(f'RMSprop with alpha==0.0 is not supported!')
         if centered:
-            raise NotImplementError(f'Centered RMSprop is not supported!')
+            raise NotImplementedError(f'Centered RMSprop is not supported!')
         super(RMSprop32bit, self).__init__('rmsprop', params, lr, (alpha, momentum), eps,
                 weight_decay, 32, args, min_8bit_size, percentile_clipping, block_wise)