[docs] update docs/pretrained.md (#349)

Author: JiJiJiang

docs/pretrained.md

@@ -39,6 +39,8 @@ in [the voxconverse recipe](https://github.com/wenet-e2e/wespeaker/tree/master/e
 
 ## Model List
 
+The model with suffix **LM** means that it is further fine-tuned using large-margin fine-tuning, which could perform better on long audios, e.g. >3s.
+
 ### modelscope
 
 | Datasets                                      | Languages | Checkpoint (pt)                                                                                                                                                                                                                     | Runtime Model (onnx)                                                                                                                                                                                                                  |

examples/voxceleb/v2/run_wavlm.sh

@@ -12,7 +12,7 @@ data_type="shard"  # shard/raw
 
 config=conf/ecapa_tdnn_WavLM_frozen.yaml
 exp_dir=exp/ECAPA_TDNN_GLOB_c512-ASTP-emb192-WavLM_large_frozen_num_frms150-aug0.6-spTrue-saFalse-ArcMargin_intertopk_subcenter-SGD-epoch150
-gpus="[0,1,2,3]" #,4,5,6,7]"
+gpus="[0,1,2,3,4,5,6,7]"
 num_avg=10
 checkpoint=