From 839c981e07c73676373601b4b4c0588708209ce7 Mon Sep 17 00:00:00 2001
From: Xie Zhongle <xiezl@zju.edu.cn>
Date: Tue, 30 Sep 2025 15:35:56 +0800
Subject: [PATCH] Add the implementation of distributed ResNet for PEFT

---
 .../examples/autograd/resnet_dist.py          | 87 +++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 examples/singa_peft/examples/autograd/resnet_dist.py

diff --git a/examples/singa_peft/examples/autograd/resnet_dist.py b/examples/singa_peft/examples/autograd/resnet_dist.py
new file mode 100644
index 0000000000..6f9b56ceeb
--- /dev/null
+++ b/examples/singa_peft/examples/autograd/resnet_dist.py
@@ -0,0 +1,87 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+
+# the code is modified from
+# https://github.com/pytorch/vision/blob/master/torchvision/models/resnet.py
+
+from singa import autograd
+from singa import tensor
+from singa import device
+from singa import opt
+
+import numpy as np
+from tqdm import trange
+
+if __name__ == "__main__":
+    sgd = opt.SGD(lr=0.1, momentum=0.9, weight_decay=1e-5)
+    sgd = opt.DistOpt(sgd)
+
+    if (sgd.global_rank == 0):
+        print("Start intialization...........", flush=True)
+
+    dev = device.create_cuda_gpu_on(sgd.local_rank)
+
+    from resnet import resnet50
+    model = resnet50()
+
+    niters = 100
+    batch_size = 32
+    IMG_SIZE = 224
+
+    tx = tensor.Tensor((batch_size, 3, IMG_SIZE, IMG_SIZE), dev)
+    ty = tensor.Tensor((batch_size,), dev, tensor.int32)
+    autograd.training = True
+    x = np.random.randn(batch_size, 3, IMG_SIZE, IMG_SIZE).astype(np.float32)
+    y = np.random.randint(0, 1000, batch_size, dtype=np.int32)
+    tx.copy_from_numpy(x)
+    ty.copy_from_numpy(y)
+
+    import time
+
+    dev.Sync()
+    start = time.time()
+    fd = 0
+    softmax = 0
+    update = 0
+    with trange(niters) as t:
+        for _ in t:
+            dev.Sync()
+            tick = time.time()
+            x = model(tx)
+            dev.Sync()
+            fd += time.time() - tick
+            tick = time.time()
+            loss = autograd.softmax_cross_entropy(x, ty)
+            dev.Sync()
+            softmax += time.time() - tick
+            sgd.backward_and_update(loss)
+
+    dev.Sync()
+    end = time.time()
+    throughput = float(sgd.world_size * niters * batch_size) / (end - start)
+    titer = (end - start) / float(niters)
+    tforward = float(fd) / float(niters)
+    tsoftmax = float(softmax) / float(niters)
+    tbackward = titer - tforward - tsoftmax
+
+    if (sgd.global_rank == 0):
+        print("\nThroughput = {} per second".format(throughput), flush=True)
+        print("Total={}, forward={}, softmax={}, backward={}".format(
+            titer, tforward, tsoftmax, tbackward),
+              flush=True)