X-Git-Url: https://fleuret.org/cgi-bin/gitweb/gitweb.cgi?a=blobdiff_plain;f=eingather.py;h=e73e63ff384640a8f5edec5f3e2f347c4a59d0e2;hb=a5ee870f51cbe71921166fb6466a12f1382e670e;hp=2310c55617057bb379964732a887740e4a6b046d;hpb=172e910a892476ab757ce9a593e6fe25de605464;p=pytorch.git

diff --git a/eingather.py b/eingather.py
index 2310c55..e73e63f 100755
--- a/eingather.py
+++ b/eingather.py
@@ -10,53 +10,46 @@ import re, torch
 #####################
 
 
-def eingather(op, src, index):
+def eingather(op, src, *indexes):
     s_src, s_dst = re.search("^([^ ]*) *-> *(.*)", op).groups()
-    s_index = re.search("\(([^)]*)\)", s_src).group(1)
+    s_indexes = re.findall("\(([^)]*)\)", s_src)
     s_src = re.sub("\([^)]*\)", "_", s_src)
 
-    shape = tuple(src.size(s_src.index(v)) for v in s_dst)
+    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 = []
+    def do(x,s_x):
+        idx = []
+        n_index = 0
 
-    for i in range(index.dim()):
-        v = s_index[i]
-        j = s_dst.index(v)
-        a = (
-            torch.arange(index.size(i))
-            .reshape((1,) * j + (-1,) + (1,) * (len(s_dst) - j - 1))
-            .expand(shape)
-        )
-        idx.append(a)
+        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(x.size(i))
+                    .reshape((1,) * j + (-1,) + (1,) * (len(s_dst) - j - 1))
+                    .expand(shape)
+                )
+                idx.append(a)
 
-    index = index[idx]
-
-    idx = []
-
-    for i in range(src.dim()):
-        v = s_src[i]
-        if v == "_":
-            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 src[idx]
+        return x[idx]
 
+    return do(src,s_src)
 
 #######################
 
 src = torch.rand(3, 5, 7, 11)
-index = torch.randint(src.size(2), (src.size(3), src.size(1), src.size(3)))
+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,index[e,a,e],e]
+# I want result[a, c, e] = src[c, a, index1[e, a, e], index2[a]]
 
-result = eingather("ca(eae)e -> ace", src, index)
+result = eingather("ca(eae)(a) -> ace", src, index1, index2)
 
 # Check
 
@@ -65,6 +58,6 @@ error = 0
 for a in range(result.size(0)):
     for c in range(result.size(1)):
         for e in range(result.size(2)):
-            error += (result[a, c, e] - src[c, a, index[e, a, e], e]).abs()
+            error += (result[a, c, e] - src[c, a, index1[e, a, e], index2[a]]).abs()
 
 print(error.item())