From 048b6b6259a715c4b8225d493fdcd8df88e42b1f Mon Sep 17 00:00:00 2001 From: Daniel Povey Date: Sun, 15 Jan 2023 00:21:01 +0800 Subject: [PATCH] Make scale in NonlinAttention have glu nonlinearity. --- .../ASR/pruned_transducer_stateless7/zipformer.py | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/egs/librispeech/ASR/pruned_transducer_stateless7/zipformer.py b/egs/librispeech/ASR/pruned_transducer_stateless7/zipformer.py index 789fe9489..91551f185 100644 --- a/egs/librispeech/ASR/pruned_transducer_stateless7/zipformer.py +++ b/egs/librispeech/ASR/pruned_transducer_stateless7/zipformer.py @@ -1602,7 +1602,7 @@ class NonlinAttention(nn.Module): self.hidden_channels = hidden_channels - self.in_proj = nn.Linear(channels, hidden_channels * 3, bias=True) + self.in_proj = nn.Linear(channels, hidden_channels * 4, bias=True) # balancer that goes before the sigmoid. Have quite a large min_abs value, at 2.0, # because we noticed that well-trained instances of this module have abs-value before the sigmoid @@ -1655,7 +1655,9 @@ attn_weights: a Tensor of shape (num_heads, batch_size, seq_len, seq_len) (seq_len, batch_size, _) = x.shape hidden_channels = self.hidden_channels - s, x, y = x.chunk(3, dim=-1) + x, y = x.chunk(2, dim=-1) + + s, x = x.chunk(2, dim=-1) # s will go through tanh. @@ -1677,7 +1679,7 @@ attn_weights: a Tensor of shape (num_heads, batch_size, seq_len, seq_len) # now x: (num_heads, batch_size, seq_len, head_dim) x = x.permute(2, 1, 0, 3).reshape(seq_len, batch_size, -1) - + y = torch.nn.functional.glu(y, dim=-1) y = self.identity2(y) x = x * y x = self.identity3(x)