Merge branch 'apex_ln_fix' into 'main'

Fix for newer apex version

See merge request ADLR/megatron-lm!1021

Author: jaredcasper

megatron/model/fused_layer_norm.py

@@ -19,9 +19,9 @@
     HAVE_PERSIST_LAYER_NORM = False
 
 try:
-    from apex.normalization.fused_layer_norm import FusedLayerNormAffineFunction
+    from apex.normalization.fused_layer_norm import fused_layer_norm_affine
 except:
-    FusedLayerNormAffineFunction = None
+    fused_layer_norm_affine = None
 
 global fused_layer_norm_cuda
 fused_layer_norm_cuda = None
@@ -79,9 +79,9 @@ def forward(self, input):
     weight = self.weight + 1 if self.apply_layernorm_1p else self.weight
 
     if self.no_persist_layer_norm:
-        assert FusedLayerNormAffineFunction is not None, \
-            "FusedLayerNormAffineFunction is not available, please install apex from https://github.com/NVIDIA/apex"
-        return FusedLayerNormAffineFunction.apply(input, weight, self.bias, self.normalized_shape, self.eps)
+        assert fused_layer_norm_affine is not None, \
+            "fused_layer_norm_affine is not available, please install apex from https://github.com/NVIDIA/apex"
+        return fused_layer_norm_affine(input, weight, self.bias, self.normalized_shape, eps=self.eps)
     else:
         output = FastLayerNormFN.apply(input, weight, self.bias, self.eps)