imatrix : handle partial entries

[ggerganov]

fix #7816

Print warning messages when imatrix entries have zero counts:

compute_imatrix: tokenizing the input ..
compute_imatrix: tokenization took 22899.3 ms
compute_imatrix: computing over 4918 chunks with batch_size 256
compute_imatrix: 12.00 seconds per pass - ETA 16 hours 23.53 minutes
[1]6.6864,[2]9.1522,[3]9.9931,[4]8.8414,
save_imatrix: entry '             blk.17.ffn_down_exps.weight' has partial data (93.75%) - skipping
save_imatrix: entry '             blk.17.ffn_gate_exps.weight' has partial data (93.75%) - skipping
save_imatrix: entry '               blk.17.ffn_up_exps.weight' has partial data (93.75%) - skipping
save_imatrix: entry '             blk.16.ffn_down_exps.weight' has partial data (73.44%) - skipping
save_imatrix: entry '             blk.16.ffn_gate_exps.weight' has partial data (73.44%) - skipping
save_imatrix: entry '               blk.16.ffn_up_exps.weight' has partial data (73.44%) - skipping
save_imatrix: entry '             blk.15.ffn_down_exps.weight' has partial data (78.12%) - skipping
save_imatrix: entry '             blk.14.ffn_down_exps.weight' has partial data (60.94%) - skipping
save_imatrix: entry '               blk.14.ffn_up_exps.weight' has partial data (60.94%) - skipping
save_imatrix: entry '              blk.1.ffn_down_exps.weight' has partial data (78.12%) - skipping
save_imatrix: entry '             blk.13.ffn_gate_exps.weight' has partial data (62.50%) - skipping
save_imatrix: entry '             blk.13.ffn_down_exps.weight' has partial data (62.50%) - skipping
save_imatrix: entry '             blk.11.ffn_down_exps.weight' has partial data (59.38%) - skipping
save_imatrix: entry '               blk.11.ffn_up_exps.weight' has partial data (59.38%) - skipping
save_imatrix: entry '             blk.15.ffn_gate_exps.weight' has partial data (78.12%) - skipping
save_imatrix: entry '               blk.15.ffn_up_exps.weight' has partial data (78.12%) - skipping
save_imatrix: entry '             blk.14.ffn_gate_exps.weight' has partial data (60.94%) - skipping
save_imatrix: entry '             blk.12.ffn_down_exps.weight' has partial data (62.50%) - skipping
save_imatrix: entry '             blk.12.ffn_gate_exps.weight' has partial data (62.50%) - skipping
save_imatrix: entry '               blk.12.ffn_up_exps.weight' has partial data (62.50%) - skipping
save_imatrix: entry '              blk.3.ffn_down_exps.weight' has partial data (98.44%) - skipping
save_imatrix: entry '                blk.1.ffn_up_exps.weight' has partial data (78.12%) - skipping
save_imatrix: entry '               blk.13.ffn_up_exps.weight' has partial data (62.50%) - skipping
save_imatrix: entry '              blk.1.ffn_gate_exps.weight' has partial data (78.12%) - skipping
save_imatrix: entry '              blk.3.ffn_gate_exps.weight' has partial data (98.44%) - skipping
save_imatrix: entry '                blk.3.ffn_up_exps.weight' has partial data (98.44%) - skipping
save_imatrix: entry '              blk.2.ffn_down_exps.weight' has partial data (96.88%) - skipping
save_imatrix: entry '              blk.2.ffn_gate_exps.weight' has partial data (96.88%) - skipping
save_imatrix: entry '             blk.11.ffn_gate_exps.weight' has partial data (59.38%) - skipping
save_imatrix: entry '                blk.2.ffn_up_exps.weight' has partial data (96.88%) - skipping
save_imatrix: warning: storing only 306 out of 336 entries

save_imatrix: stored collected data after 10 chunks in imatrix.dat

Such entries are not stored in the output matrix to prevent errors when using the imatrix. To prevent this from happening, provide larger and more diverse training data