add VibeVoice-Realtime

vibevoice/schedule/timestep_sampler.py

@@ -0,0 +1,19 @@
+import math
+import torch
+
+
+class UniformSampler:
+    def __init__(self, timesteps = 1000):
+        self.timesteps = timesteps
+    def sample(self, batch_size, device):
+        return torch.randint(0, self.timesteps, (batch_size,), device=device)
+    
+class LogitNormalSampler:
+    def __init__(self, timesteps = 1000, m = 0, s = 1):
+        self.timesteps = timesteps
+        timesteps = torch.linspace(0, 1, timesteps)
+        logit = torch.log(timesteps / (1 - timesteps))
+        self.prob = torch.exp(-0.5 * (logit - m) ** 2 / s ** 2) / (s * math.sqrt(2 * math.pi))
+    def sample(self, batch_size, device):
+        return torch.multinomial(self.prob, batch_size, replacement=True).to(device)
+