X-Git-Url: https://fleuret.org/cgi-bin/gitweb/gitweb.cgi?a=blobdiff_plain;f=eingather.py;h=734edbea92288f4145d63aafa2ec398fdb51c12a;hb=7e0d32924fda14c2ddfe23a63616eac33476d83c;hp=b27110022263045413c87e0e4327ba2902aca283;hpb=7d526f2fa3849a4a049b3a1da4dddb92e3132428;p=pytorch.git

diff --git a/eingather.py b/eingather.py
index b271100..734edbe 100755
--- a/eingather.py
+++ b/eingather.py
@@ -15,43 +15,31 @@ def eingather(op, src, *indexes):
     s_indexes = re.findall("\(([^)]*)\)", s_src)
     s_src = re.sub("\([^)]*\)", "_", s_src)
 
-    all_sizes = tuple(d for s in ( src, ) + indexes for d in s.size())
+    all_sizes = tuple(d for s in (src,) + indexes for d in s.size())
     s_all = "".join([s_src] + s_indexes)
     shape = tuple(all_sizes[s_all.index(v)] for v in s_dst)
 
-    idx = []
-    n_index = 0
+    def do(x, s_x):
+        idx = []
+        n_index = 0
 
-    for i in range(src.dim()):
-        v = s_src[i]
-        if v == "_":
-            index, s_index = indexes[n_index], s_indexes[n_index]
-            n_index += 1
-
-            sub_idx = []
-
-            for i in range(index.dim()):
-                v = s_index[i]
+        for i in range(x.dim()):
+            v = s_x[i]
+            if v == "_":
+                idx.append(do(indexes[n_index], s_indexes[n_index]))
+                n_index += 1
+            else:
                 j = s_dst.index(v)
                 a = (
-                    torch.arange(index.size(i))
+                    torch.arange(x.size(i))
                     .reshape((1,) * j + (-1,) + (1,) * (len(s_dst) - j - 1))
                     .expand(shape)
                 )
-                sub_idx.append(a)
+                idx.append(a)
 
-            index = index[sub_idx]
-            idx.append(index)
-        else:
-            j = s_dst.index(v)
-            a = (
-                torch.arange(src.size(i))
-                .reshape((1,) * j + (-1,) + (1,) * (len(s_dst) - j - 1))
-                .expand(shape)
-            )
-            idx.append(a)
+        return x[idx]
 
-    return src[idx]
+    return do(src, s_src)
 
 
 #######################
@@ -60,7 +48,7 @@ src = torch.rand(3, 5, 7, 11)
 index1 = torch.randint(src.size(2), (src.size(3), src.size(1), src.size(3)))
 index2 = torch.randint(src.size(3), (src.size(1),))
 
-# I want result[a, c, e] = src[c, a, index1[e, a, e], index2[a], e]
+# result[a, c, e] = src[c, a, index1[e, a, e], index2[a]]
 
 result = eingather("ca(eae)(a) -> ace", src, index1, index2)