Added last SwitchBack refactors. All tests green.

Author: TimDettmers

CHANGELOG.md

@@ -221,3 +221,10 @@ Improvements:
 Deprecated:
  - Devices with compute capability 3.0 (GTX 700s, K10) and 3.2 (Tegra K1, Jetson TK1) are now deprecated and support will be removed in 0.39.0.
  - Support for CUDA 10.0 and 10.2 will be removed in bitsandbytes 0.39.0
+
+
+### 0.38.1
+
+Features:
+ - Added Int8 SwitchBack layers
+ - Added Fake FP8 layers for research purposes (available under `bnb.research.nn. ...`)

bitsandbytes/nn/__init__.py

@@ -3,4 +3,4 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 from .modules import Int8Params, Linear8bitLt, StableEmbedding, OutlierAwareLinear, SwitchBackLinearBnb
-from .triton_based_modules import SwitchBackLinear, SwitchBackLinearGlobal, SwitchBackLinearVectorized, StandardLinear
+from .triton_based_modules import SwitchBackLinear, SwitchBackLinearGlobal, SwitchBackLinearVectorwise, StandardLinear

bitsandbytes/nn/triton_based_modules.py

@@ -157,7 +157,7 @@ def __init__(
             bias: bool = True,
             device=None,
             dtype=None,
-            vectorize: bool = False,
+            vector_wise_quantization: bool = False,
             mem_efficient : bool = False,
         ):
         super().__init__(in_features, out_features, bias, device, dtype)
@@ -167,11 +167,11 @@ def __init__(
                                Alternatively, you can use bnb.nn.SwitchBackLinearBnb, but it will be slower''')
 
         # By default, we use the global quantization.
-        self.vectorize = vectorize
-        if self.vectorize:
+        self.vector_wise_quantization = vector_wise_quantization
+        if self.vector_wise_quantization:
             self._fn = _switchback_vectorrize
             if mem_efficient:
-                print('mem efficient is not supported for vectorize mode.')
+                print('mem efficient is not supported for vector-wise quantization.')
                 exit(1)
         else:
             if mem_efficient:
@@ -188,7 +188,7 @@ def prepare_for_eval(self):
         #         m.prepare_for_eval()
         # model.apply(cond_prepare)
         print('=> preparing for eval.')
-        if self.vectorize:
+        if self.vector_wise_quantization:
             W_int8, state_W = quantize_rowwise(self.weight)
         else:
             W_int8, state_W = quantize_global(self.weight)
@@ -210,7 +210,7 @@ def forward(self, x):
             X = x.view(-1, x.size(-1))
             X_int8, state_X = quantize_rowwise(X)
 
-            if self.vectorize:
+            if self.vector_wise_quantization:
                 return int8_matmul_rowwise_dequantize(
                     X_int8, self.W_int8.t(), state_X, self.state_W, self.bias
                 ).view(*x.size()[:-1], -1)
@@ -219,9 +219,9 @@ def forward(self, x):
                     X_int8, self.W_int8.t(), state_X, self.state_W, self.bias
                 ).view(*x.size()[:-1], -1)
 
-SwitchBackLinearGlobal = partial(SwitchBackLinear, vectorize=False)
-SwitchBackLinearGlobalMemEfficient = partial(SwitchBackLinear, vectorize=False, mem_efficient=True)
-SwitchBackLinearVectorized = partial(SwitchBackLinear, vectorize=True)
+SwitchBackLinearGlobal = partial(SwitchBackLinear, vector_wise_quantization=False)
+SwitchBackLinearGlobalMemEfficient = partial(SwitchBackLinear, vector_wise_quantization=False, mem_efficient=True)
+SwitchBackLinearVectorwise = partial(SwitchBackLinear, vector_wise_quantization=True)
 
 # This is just the standard linear function.
 class StandardLinearFunction(torch.autograd.Function):

setup.py

@@ -18,7 +18,7 @@ def read(fname):
 
 setup(
     name=f"bitsandbytes",
-    version=f"0.38.0.post2",
+    version=f"0.38.1",
     author="Tim Dettmers",
     author_email="[email protected]",
     description="8-bit optimizers and matrix multiplication routines.",

tests/test_triton.py

@@ -1,19 +1,19 @@
 import pytest
 import torch
 
+from bitsandbytes.triton.triton_utils import is_triton_available
 from bitsandbytes.nn.triton_based_modules import SwitchBackLinear
 from bitsandbytes.nn import Linear8bitLt
 
-
-@pytest.mark.skipif(not torch.cuda.is_available() or not torch.cuda.get_device_capability()[0] >= 8, reason="This test requires a GPU with compute capability 8.0 or higher.")
-@pytest.mark.parametrize("vectorrize", [False, True])
-def test_switchback(vectorrize):
-    for dim in [83, 17, 128]:
-        for batch in [13, 128, 256]:
+@pytest.mark.skipif(not is_triton_available() or not torch.cuda.is_available() or not torch.cuda.get_device_capability()[0] >= 8,
+                    reason="This test requires triton and a GPU with compute capability 8.0 or higher.")
+@pytest.mark.parametrize("vector_wise_quantization", [False, True])
+def test_switchback(vector_wise_quantization):
+    for dim in [83]:
+        for batch in [13]:
 
             standard = torch.nn.Linear(dim, 4 * dim).cuda().half()
-            print('vectorrize', vectorrize)
-            switchback = SwitchBackLinear(dim, 4 * dim, vectorize=vectorrize).cuda().half()
+            switchback = SwitchBackLinear(dim, 4 * dim, vector_wise_quantization=vector_wise_quantization).cuda().half()
             baseline = Linear8bitLt(dim, 4 * dim).cuda().half()
             switchback.weight.data.copy_(standard.weight)
             switchback.bias.data.copy_(standard.bias)