diff --git a/icefall/diagnostics.py b/icefall/diagnostics.py
index 91580f986..2367f7171 100644
--- a/icefall/diagnostics.py
+++ b/icefall/diagnostics.py
@@ -376,13 +376,11 @@ class ScalarDiagnostic(object):
             # sum_gradsq is for getting error bars.
             self.sum_gradsq = torch.zeros(2 * num_ticks_per_side, dtype=torch.double, device=x.device)
             self.sum_abs_grad = torch.zeros(2 * num_ticks_per_side, dtype=torch.double, device=x.device)
-            print("tick scale:", self.tick_scale)
 
         # this will round down.
         x = (x / self.tick_scale).to(torch.long)
         x = x.clamp_(min=-num_ticks_per_side, max=num_ticks_per_side - 1)
         x = x + num_ticks_per_side
-        print("x indexes: ", x)
 
         self.counts.index_add_(dim=0, index=x, source=torch.ones_like(x))
         self.sum_grad.index_add_(dim=0, index=x, source=grad.to(torch.double))