Remove unused utility function

PiperOrigin-RevId: 814239959
Change-Id: I663c91b969fd942c8c560ecb504ea21ab8d1be5d

alphafold/model/tf/utils.py

@@ -16,14 +16,6 @@
 import tensorflow.compat.v1 as tf
 
 
-def tf_combine_mask(*masks):
-  """Take the intersection of float-valued masks."""
-  ret = 1
-  for m in masks:
-    ret *= m
-  return ret
-
-
 class SeedMaker(object):
   """Return unique seeds."""