VoxCPM-Kernel/VoxCPM2-First-Patch-Listening-Check

VoxCPM2 first-patch listening check (#31)

Listening pairs for issue #31 (first audio under 100 ms p99 at 200 requests at once): the same sentence generated twice, both in waves of 128 new requests. main solves the first 160 ms patch in 3 LocDiT steps; branch #31 solves it in 2 (the grid of the 2-step student the 3-step one was trained from), which cuts ~11 ms of GPU from the first audio at 200 requests. Every later patch is solved in 3 steps in both, but the rest of the sentence follows the first patch, so the two versions are different takes of the sentence, not the same audio with a different start.

On the #2 set (1,320 clips) nothing changed significantly over whole clips (CER, WER, UTMOS, DNSMOS, speaker similarity). The first second's UTMOS is lower: -0.04 (2.46 -> 2.42, 95 % interval -0.065 to -0.022). Listen to the start of each pair: if branch #31's openings sound worse (noisier, muffled, a click or a smeared first syllable), the change should not ship.

The dataset viewer above plays both versions of a sentence side by side: one row per dialect, the main and branch_31 columns.

Each clip is the opening of a sentence, cut after whole words (at least 3 words and 1 s), checked with Whisper large-v3 so that the words are heard.

dialect	words	length	main	branch #31
البحرينية (bh)	والعكس أيضا، الشركات	2.4 s	main	branch #31
الجزائرية (dz)	في جنينت القصر	1.7 s	main	branch #31
الجزائرية (dz)	وٱلحمد لله، بفضل	2.5 s	main	branch #31
الجزائرية (dz)	دخلو للمدينة، صرفو	2.0 s	main	branch #31
المصرية (eg)	بأعتقد إن الماسونية	1.4 s	main	branch #31
الحجازية (hejazi)	طيب خلاص الصبح	2.2 s	main	branch #31
العراقية (iq)	هو يشتغل صباغ،	1.7 s	main	branch #31
الخليجية (khaliji)	شفتي شلون بيتنا	1.9 s	main	branch #31
الخليجية (khaliji)	عبوتي عاد عبوتي	1.4 s	main	branch #31
الخليجية (khaliji)	واليوم الفجر طلع	1.9 s	main	branch #31
اللبنانية (lb)	فنجان مشقوق، بضل	2.4 s	main	branch #31
الليبية (ly)	وبعدين لما تسأل	1.2 s	main	branch #31
المغربية (ma)	ودبا خاصكم تديوها	2.0 s	main	branch #31
الفصحى (msa)	يقال أن ثقافة	1.3 s	main	branch #31
النجدية (najdi)	القرية هذه مهجورة	2.0 s	main	branch #31
النجدية (najdi)	بس ان شاء الله	1.0 s	main	branch #31
النجدية (najdi)	يعني أنا أفهم	1.3 s	main	branch #31
الفلسطينية (ps)	فلما هي تشعر	1.6 s	main	branch #31
السعودية (sa)	يوصل لكم في أي مكان،	1.2 s	main	branch #31
السودانية (sd)	ال اللي هو	1.5 s	main	branch #31
السورية (sy)	بوجود القيادات القوية	1.7 s	main	branch #31
التونسية (tn)	ٱلإنسان المقابل، المريض	2.3 s	main	branch #31
التونسية (tn)	ٱلميل ٱلجنسي موجود	1.4 s	main	branch #31
اليمنية (ye)	لن يحدث هذا	1.5 s	main	branch #31

Skipped: 50 sentence(s) that failed the word check (no word heard at the start, an opening that does not match the text's first word, or a cut clip that lost its words): dz-0039_s2000, hejazi-0422_s2000, iq-0307_s2000, iq-0302_s2000, iq-0308_s2000, iq-0329_s2000, iq-0309_s2000, khaliji-0559_s2000, khaliji-0451_s2000, khaliji-0474_s2000, khaliji-0473_s2000, khaliji-0558_s2000, khaliji-0467_s2000, khaliji-0556_s2000, lb-0111_s2000, ly-0127_s2000, ly-0135_s2000, ly-0125_s2000, ma-0349_s2000, msa-0494_s2000, sa-0384_s2000, sd-0623_s2000, sd-0184_s2000, sy-0630_s2000, tn-0242_s2000, tn-0241_s2000, ye-0295_s2000, khaliji-0450_s2000, khaliji-0477_s2000, khaliji-0462_s2000, khaliji-0471_s2000, khaliji-0479_s2000, khaliji-0465_s2000, najdi-0399_s2000, najdi-0596_s2000, dz-0030_s2000, dz-0057_s2000, dz-0053_s2000, dz-0520_s2000, dz-0046_s2000, dz-0043_s2000, dz-0033_s2000, dz-0047_s2000, tn-0258_s2000, tn-0246_s2000, tn-0649_s2000, tn-0256_s2000, tn-0265_s2000, tn-0643_s2000, tn-0269_s2000.

Gated: the voices are cloned from the gated Arabic-Hindi-Reference-Voices.