Add pretrained model for the giga branch

exp/giga/decode.sh

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+#!/usr/bin/env bash
+
+export CUDA_VISIBLE_DEVICES="7"
+
+. path.sh
+
+# for m in greedy_search fast_beam_search modified_beam_search; do
+for m in greedy_search ; do
+  for iter in 468000; do
+    for avg in 16; do
+      ./lstm_transducer_stateless2/decode.py \
+        --use-giga-branch 1 \
+        --iter $iter \
+        --avg $avg \
+        --exp-dir lstm_transducer_stateless2/exp \
+        --max-duration 600 \
+        --num-encoder-layers 12 \
+        --rnn-hidden-size 1024 \
+        --decoding-method $m \
+        --use-averaged-model True \
+        --beam 4 \
+        --max-contexts 4 \
+        --max-states 8 \
+        --beam-size 4
+    done
+  done
+done

exp/giga/decoder_jit_trace-iter-468000-avg-16-giga.pt

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:a37d7c11a48fce68eb34dfe4a0c9fa09116b7baa4755073d606c19cd02d9ecf5
+size 1033475

exp/giga/encoder_jit_trace-iter-468000-avg-16-giga.pt

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:673dc98d44530ca11edc6cb37acd8c385714a17fb908a78f69606e1a1af2291e
+size 332784613

exp/giga/export.sh

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+#!/usr/bin/env bash
+
+export CUDA_VISIBLE_DEVICES=""
+
+. path.sh
+
+iter=468000
+avg=16
+
+iter=472000
+avg=18
+
+set -ex
+
+if true; then
+  ./lstm_transducer_stateless2/export.py \
+    --use-giga-branch 1 \
+    --exp-dir ./lstm_transducer_stateless2/exp \
+    --bpe-model data/lang_bpe_500/bpe.model \
+    --iter $iter \
+    --avg  $avg \
+    --pnnx 1
+  mv -v lstm_transducer_stateless2/exp/encoder_jit_trace-pnnx-giga.pt lstm_transducer_stateless2/exp/encoder_jit_trace-iter-$iter-avg-$avg-pnnx-giga.pt
+  mv -v lstm_transducer_stateless2/exp/decoder_jit_trace-pnnx-giga.pt lstm_transducer_stateless2/exp/decoder_jit_trace-iter-$iter-avg-$avg-pnnx-giga.pt
+  mv -v lstm_transducer_stateless2/exp/joiner_jit_trace-pnnx-giga.pt lstm_transducer_stateless2/exp/joiner_jit_trace-iter-$iter-avg-$avg-pnnx-giga.pt
+fi
+
+if true; then
+  ./lstm_transducer_stateless2/export.py \
+    --use-giga-branch 1 \
+    --exp-dir ./lstm_transducer_stateless2/exp \
+    --bpe-model data/lang_bpe_500/bpe.model \
+    --iter $iter \
+    --avg  $avg \
+    --jit-trace 1
+  mv lstm_transducer_stateless2/exp/encoder_jit_trace-giga.pt lstm_transducer_stateless2/exp/encoder_jit_trace-iter-$iter-avg-$avg-giga.pt
+  mv lstm_transducer_stateless2/exp/decoder_jit_trace-giga.pt lstm_transducer_stateless2/exp/decoder_jit_trace-iter-$iter-avg-$avg-giga.pt
+  mv lstm_transducer_stateless2/exp/joiner_jit_trace-giga.pt lstm_transducer_stateless2/exp/joiner_jit_trace-iter-$iter-avg-$avg-giga.pt
+fi
+
+if true; then
+  ./lstm_transducer_stateless2/export.py \
+    --use-giga-branch 1 \
+    --exp-dir ./lstm_transducer_stateless2/exp \
+    --bpe-model data/lang_bpe_500/bpe.model \
+    --iter $iter \
+    --avg  $avg \
+    --jit-trace 0
+  mv lstm_transducer_stateless2/exp/pretrained-giga.pt lstm_transducer_stateless2/exp/pretrained-iter-$iter-avg-$avg-giga.pt
+fi

exp/giga/joiner_jit_trace-iter-468000-avg-16-giga.pt

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:55af03bb72da9be1255baab8cfa1b8218ae6c87071a437a4c213f143d649d9aa
+size 3134718

exp/giga/pretrained-iter-468000-avg-16-giga.pt

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:ac881ea4cad22925f461cdbf5cb0c8c7e3b5cbfb82b643f60c523013c0a02ab4
+size 338850087