CEM semantic task validation: code and results

Training and evaluation code for the text-transmission experiment
(Sec. III-E) of the IEEE Signal Processing Letters manuscript
"Contrastive Embedding Multiplexing for Multi-User Semantic
Communication Systems" (SPL-48226-2026), together with the
supplementary runs reported in the response to the reviewers.

results/results_bleu.csv

@@ -0,0 +1,15 @@
+run,snr_db,BLEU
+text_ce,10.0,0.117381
+text_ce,20.0,0.117850
+text_nce0.01,10.0,0.156389
+text_nce0.01,20.0,0.162524
+text_ce_U1,10.0,0.993949
+text_ce_U1,20.0,0.994508
+text_nce0.01_U8_d256,10.0,0.976007
+text_nce0.01_U8_d256,20.0,0.986334
+text_nce0_U4,10.0,0.183441
+text_nce0_U4,20.0,0.184090
+text_nce0.001_U4,10.0,0.368625
+text_nce0.001_U4,20.0,0.394380
+text_nce0.001_d256,10.0,0.456128
+text_nce0.001_d256,20.0,0.491390