make sure library can work on mac m1/m2 chip

Author: lucidrains

vector_quantize_pytorch/vector_quantize_pytorch.py

@@ -27,6 +27,15 @@ def l2norm(t):
 def log(t, eps = 1e-20):
     return torch.log(t.clamp(min = eps))
 
+def lerp(old, new, decay):
+    is_mps = getattr(old, 'is_mps', False)
+
+    if not is_mps:
+        old.lerp_(new, 1 - decay)
+        return old
+
+    return old * decay + new * (1 - decay)
+
 def pack_one(t, pattern):
     return pack([t], pattern)
 
@@ -441,11 +450,11 @@ def forward(
             cluster_size = embed_onehot.sum(dim = 1)
 
             self.all_reduce_fn(cluster_size)
-            self.cluster_size.data.lerp_(cluster_size, 1 - self.decay)
+            self.cluster_size = lerp(self.cluster_size, cluster_size, self.decay)
 
             embed_sum = einsum('h n d, h n c -> h c d', flatten, embed_onehot)
             self.all_reduce_fn(embed_sum.contiguous())
-            self.embed_avg.data.lerp_(embed_sum, 1 - self.decay)
+            self.embed_avg = lerp(self.embed_avg, embed_sum, self.decay)
 
             cluster_size = laplace_smoothing(self.cluster_size, self.codebook_size, self.eps) * self.cluster_size.sum(dim = -1, keepdim = True)
 
@@ -598,11 +607,11 @@ def forward(
             bins = embed_onehot.sum(dim = 1)
             self.all_reduce_fn(bins)
 
-            self.cluster_size.data.lerp_(bins, 1 - self.decay)
+            self.cluster_size = lerp(self.cluster_size, bins, self.decay)
 
             embed_sum = einsum('h n d, h n c -> h c d', flatten, embed_onehot)
             self.all_reduce_fn(embed_sum.contiguous())
-            self.embed_avg.data.lerp_(embed_sum, 1 - self.decay)
+            self.embed_avg = lerp(self.embed_avg, embed_sum, self.decay)
 
             cluster_size = laplace_smoothing(self.cluster_size, self.codebook_size, self.eps) * self.cluster_size.sum(dim = -1, keepdim = True)