From b9e6327adfe0def4989ad508d0df8f6347da2c0f Mon Sep 17 00:00:00 2001
From: Teo Wen Shen <36886809+teowenshen@users.noreply.github.com>
Date: Sat, 3 Feb 2024 07:25:27 +0900
Subject: [PATCH] Fixing torch.ctc err (#1485)

* fixing torch.ctc err

* Move targets & lengths to CPU
---
 egs/librispeech/ASR/zipformer/model.py | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/egs/librispeech/ASR/zipformer/model.py b/egs/librispeech/ASR/zipformer/model.py
index f2f86af47a..73009d35c5 100644
--- a/egs/librispeech/ASR/zipformer/model.py
+++ b/egs/librispeech/ASR/zipformer/model.py
@@ -164,9 +164,9 @@ def forward_ctc(
 
         ctc_loss = torch.nn.functional.ctc_loss(
             log_probs=ctc_output.permute(1, 0, 2),  # (T, N, C)
-            targets=targets,
-            input_lengths=encoder_out_lens,
-            target_lengths=target_lengths,
+            targets=targets.cpu(),
+            input_lengths=encoder_out_lens.cpu(),
+            target_lengths=target_lengths.cpu(),
             reduction="sum",
         )
         return ctc_loss