+THByteStorage *compress(THByteStorage *x) {
+ long k, g, n;
+
+ k = 0; n = 0;
+ while(k < x->size) {
+ g = 0;
+ while(k < x->size && x->data[k] == 255 && g < 255) { g++; k++; }
+ n++;
+ if(k < x->size && g < 255) { k++; }
+ }
+
+ if(x->data[k-1] == 0) {
+ n++;
+ }
+
+ THByteStorage *result = THByteStorage_newWithSize(n);
+
+ k = 0; n = 0;
+ while(k < x->size) {
+ g = 0;
+ while(k < x->size && x->data[k] == 255 && g < 255) { g++; k++; }
+ result->data[n++] = g;
+ if(k < x->size && g < 255) { k++; }
+ }
+ if(x->data[k-1] == 0) {
+ result->data[n++] = 0;
+ }
+
+ return result;
+}
+
+THByteStorage *uncompress(THByteStorage *x) {
+ long k, g, n;
+
+ k = 0;
+ for(n = 0; n < x->size - 1; n++) {
+ k = k + x->data[n];
+ if(x->data[n] < 255) { k++; }
+ }
+ k = k + x->data[n];
+
+ THByteStorage *result = THByteStorage_newWithSize(k);
+
+ k = 0;
+ for(n = 0; n < x->size - 1; n++) {
+ for(g = 0; g < x->data[n]; g++) {
+ result->data[k++] = 255;
+ }
+ if(x->data[n] < 255) {
+ result->data[k++] = 0;
+ }
+ }
+ for(g = 0; g < x->data[n]; g++) {
+ result->data[k++] = 255;
+ }
+
+ return result;
+}
+
+void seed(long s) {
+ srand48(s);
+}
+
+THByteTensor *generate_vignettes(long n_problem, THLongTensor *labels) {