Merge pull request #1769 from Yancey1989/fast_resnet

Add fast resnet model

.gitignore

@@ -3,3 +3,4 @@
 *.user
 *.pyc
 *~
+*.vscode

fluid/PaddleCV/image_classification/fast_imagenet/README.md

+# PaddlePaddle Fast ImageNet Training
+
+PaddlePaddle Fast ImageNet can train ImageNet dataset with fewer epochs. We implemented the it according to the blog 
+[Now anyone can train Imagenet in 18 minutes](https://www.fast.ai/2018/08/10/fastai-diu-imagenet/) which published on the [fast.ai] website.
+PaddlePaddle Fast ImageNet using the dynmiac batch size, dynamic image size, rectangular images validation and etc... so that the Fast ImageNet can achieve the baseline
+(acc1: 75%, acc5: 93%) by 27 epochs on 8 * V100 GPUs.
+
+## Experiment
+
+1. Prepare the training data, resize the images to 160 and 352 using `resize.py`, the prepared data folder should look like:
+    ``` text
+    `-ImageNet
+      |-train
+      |-validation
+      |-160
+        |-train
+        `-validation
+      `-352
+        |-train
+        `-validation
+    ```
+1. Install the requirements by `pip install -r requirement.txt`.
+1. Launch the training job: `python train.py --data_dir /data/imagenet`
+1. Learning curve, we launch the training job on V100 GPU card:
+<p align="center">
+<img src="src/acc_curve.png" hspace='10' /> <br />
+</p>
+

fluid/PaddleCV/image_classification/fast_imagenet/requirements.txt

+torch==0.4.1
+torchvision
+tqdm

fluid/PaddleCV/image_classification/fast_imagenet/tools/resize.py

+from PIL import Image
+from pathlib import Path
+from concurrent.futures import ThreadPoolExecutor, ProcessPoolExecutor
+from functools import partial
+import multiprocessing
+cpus = multiprocessing.cpu_count()
+cpus = min(36,cpus)
+
+
+PATH = Path('/data/imagenet2')
+DEST = Path('/data/imagenet2/sz')
+def mkdir(path):
+    if not path.exists():
+        path.mkdir()
+
+mkdir(DEST)
+szs = (160, 352)
+
+def resize_img(p, im, fn, sz):
+    w,h = im.size
+    ratio = min(h/sz,w/sz)
+    im = im.resize((int(w/ratio), int(h/ratio)), resample=Image.BICUBIC)
+    new_fn = DEST/str(sz)/fn.relative_to(PATH)
+    mkdir(new_fn.parent())
+    im.save(new_fn)
+
+def resizes(p, fn):
+    im = Image.open(fn)
+    for sz in szs: resize_img(p, im, fn, sz)
+
+def resize_imgs(p):
+    files = p.glob('*/*.jpeg')
+    with ProcessPoolExecutor(cpus) as e: e.map(partial(resizes, p), files)
+
+
+for sz in szs:
+    ssz=str(sz)
+    mkdir((DEST/ssz))
+    for ds in ('validation','train'): mkdir((DEST/ssz/ds))
+    for ds in ('train',): mkdir((DEST/ssz/ds))
+
+for ds in ("validation", "train"):
+    print(PATH/ds)
+    resize_imgs(PATH/ds)
\ No newline at end of file

fluid/PaddleCV/image_classification/fast_imagenet/torchvision_reader.py

+import os
+
+import numpy as np
+import math
+import random
+import torch
+import torch.utils.data
+from torch.utils.data.distributed import DistributedSampler
+import torchvision.transforms as transforms
+import torchvision.datasets as datasets
+
+from torch.utils.data.sampler import Sampler
+import torchvision
+import pickle
+from tqdm import tqdm
+import time
+import multiprocessing
+
+FINISH_EVENT = "FINISH_EVENT"
+class PaddleDataLoader(object):
+    def __init__(self, torch_dataset, indices=None, concurrent=24, queue_size=3072, shuffle=True, shuffle_seed=0):
+        self.torch_dataset = torch_dataset
+        self.data_queue = multiprocessing.Queue(queue_size)
+        self.indices = indices
+        self.concurrent = concurrent
+        self.shuffle = shuffle
+        self.shuffle_seed=shuffle_seed
+
+    def _worker_loop(self, dataset, worker_indices, worker_id):
+        cnt = 0
+        for idx in worker_indices:
+            cnt += 1
+            img, label = self.torch_dataset[idx]
+            img = np.array(img).astype('uint8').transpose((2, 0, 1))
+            self.data_queue.put((img, label))
+        print("worker: [%d] read [%d] samples. " % (worker_id, cnt))
+        self.data_queue.put(FINISH_EVENT)
+
+    def reader(self):
+        def _reader_creator():
+            worker_processes = []
+            total_img = len(self.torch_dataset)
+            print("total image: ", total_img)
+            if self.shuffle:
+                self.indices = [i for i in xrange(total_img)]
+                random.seed(self.shuffle_seed)
+                random.shuffle(self.indices)
+                print("shuffle indices: %s ..." % self.indices[:10])
+
+            imgs_per_worker = int(math.ceil(total_img / self.concurrent))
+            for i in xrange(self.concurrent):
+                start = i * imgs_per_worker
+                end = (i + 1) * imgs_per_worker if i != self.concurrent - 1 else None
+                sliced_indices = self.indices[start:end]
+                w = multiprocessing.Process(
+                    target=self._worker_loop,
+                    args=(self.torch_dataset, sliced_indices, i)
+                )
+                w.daemon = True
+                w.start()
+                worker_processes.append(w)
+            finish_workers = 0
+            worker_cnt = len(worker_processes)
+            while finish_workers < worker_cnt:
+                sample = self.data_queue.get()
+                if sample == FINISH_EVENT:
+                    finish_workers += 1
+                else:
+                    yield sample
+
+        return _reader_creator
+
+def train(traindir, sz, min_scale=0.08, shuffle_seed=0):
+    train_tfms = [
+        transforms.RandomResizedCrop(sz, scale=(min_scale, 1.0)),
+        transforms.RandomHorizontalFlip()
+    ]
+    train_dataset = datasets.ImageFolder(traindir, transforms.Compose(train_tfms))
+    return PaddleDataLoader(train_dataset, shuffle_seed=shuffle_seed).reader()
+
+def test(valdir, bs, sz, rect_val=False):
+    if rect_val:
+        idx_ar_sorted = sort_ar(valdir)
+        idx_sorted, _ = zip(*idx_ar_sorted)
+        idx2ar = map_idx2ar(idx_ar_sorted, bs)
+
+        ar_tfms = [transforms.Resize(int(sz* 1.14)), CropArTfm(idx2ar, sz)]
+        val_dataset = ValDataset(valdir, transform=ar_tfms)
+        return PaddleDataLoader(val_dataset, concurrent=1, indices=idx_sorted, shuffle=False).reader()
+
+    val_tfms = [transforms.Resize(int(sz* 1.14)), transforms.CenterCrop(sz)]
+    val_dataset = datasets.ImageFolder(valdir, transforms.Compose(val_tfms))
+
+    return PaddleDataLoader(val_dataset).reader()
+
+
+class ValDataset(datasets.ImageFolder):
+    def __init__(self, root, transform=None, target_transform=None):
+        super(ValDataset, self).__init__(root, transform, target_transform)
+
+    def __getitem__(self, index):
+        path, target = self.imgs[index]
+        sample = self.loader(path)
+        if self.transform is not None:
+            for tfm in self.transform:
+                if isinstance(tfm, CropArTfm):
+                    sample = tfm(sample, index)
+                else:
+                    sample = tfm(sample)
+        if self.target_transform is not None:
+            target = self.target_transform(target)
+
+        return sample, target
+
+
+class CropArTfm(object):
+    def __init__(self, idx2ar, target_size):
+        self.idx2ar, self.target_size = idx2ar, target_size
+
+    def __call__(self, img, idx):
+        target_ar = self.idx2ar[idx]
+        if target_ar < 1:
+            w = int(self.target_size / target_ar)
+            size = (w // 8 * 8, self.target_size)
+        else:
+            h = int(self.target_size * target_ar)
+            size = (self.target_size, h // 8 * 8)
+        return torchvision.transforms.functional.center_crop(img, size)
+
+
+def sort_ar(valdir):
+    idx2ar_file = valdir + '/../sorted_idxar.p'
+    if os.path.isfile(idx2ar_file):
+        return pickle.load(open(idx2ar_file, 'rb'))
+    print('Creating AR indexes. Please be patient this may take a couple minutes...')
+    val_dataset = datasets.ImageFolder(valdir)  # AS: TODO: use Image.open instead of looping through dataset
+    sizes = [img[0].size for img in tqdm(val_dataset, total=len(val_dataset))]
+    idx_ar = [(i, round(s[0] * 1.0/ s[1], 5)) for i, s in enumerate(sizes)]
+    sorted_idxar = sorted(idx_ar, key=lambda x: x[1])
+    pickle.dump(sorted_idxar, open(idx2ar_file, 'wb'))
+    print('Done')
+    return sorted_idxar
+
+def chunks(l, n):
+    n = max(1, n)
+    return (l[i:i + n] for i in range(0, len(l), n))
+
+
+def map_idx2ar(idx_ar_sorted, batch_size):
+    ar_chunks = list(chunks(idx_ar_sorted, batch_size))
+    idx2ar = {}
+    for chunk in ar_chunks:
+        idxs, ars = list(zip(*chunk))
+        mean = round(np.mean(ars), 5)
+        for idx in idxs:
+            idx2ar[idx] = mean
+    return idx2ar

fluid/PaddleCV/image_classification/fast_imagenet/train.py

+# Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed 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.
+
+import argparse
+import cProfile
+import time
+import os
+import traceback
+
+import numpy as np
+import torchvision_reader
+import torch
+import paddle
+import paddle.fluid as fluid
+import paddle.fluid.core as core
+import paddle.fluid.profiler as profiler
+import paddle.fluid.transpiler.distribute_transpiler as distribute_transpiler
+
+import sys
+sys.path.append("..")
+from utility import add_arguments, print_arguments
+import functools
+from models.fast_imagenet import FastImageNet, lr_decay
+import utils
+
+def parse_args():
+    parser = argparse.ArgumentParser(description=__doc__)
+    add_arg = functools.partial(add_arguments, argparser=parser)
+    # yapf: disable
+    add_arg('total_images',     int,   1281167,              "Training image number.")
+    add_arg('num_epochs',       int,   120,                  "number of epochs.")
+    add_arg('image_shape',      str,   "3,224,224",          "input image size")
+    add_arg('model_save_dir',   str,   "output",             "model save directory")
+    add_arg('pretrained_model', str,   None,                 "Whether to use pretrained model.")
+    add_arg('checkpoint',       str,   None,                 "Whether to resume checkpoint.")
+    add_arg('lr',               float, 1.0,                  "set learning rate.")
+    add_arg('lr_strategy',      str,   "piecewise_decay",    "Set the learning rate decay strategy.")
+    add_arg('data_dir',         str,   "./data/ILSVRC2012",  "The ImageNet dataset root dir.")
+    add_arg('model_category',   str,   "models",             "Whether to use models_name or not, valid value:'models','models_name'" )
+    add_arg('fp16',             bool,  False,                "Enable half precision training with fp16." )
+    add_arg('scale_loss',       float, 1.0,                  "Scale loss for fp16." )
+    # for distributed
+    add_arg('start_test_pass',  int,    0,                  "Start test after x passes.")
+    add_arg('num_threads',      int,    8,                  "Use num_threads to run the fluid program.")
+    add_arg('reduce_strategy',  str,    "allreduce",        "Choose from reduce or allreduce.")
+    add_arg('log_period',       int,    30,                 "Print period, defualt is 5.")
+    add_arg('memory_optimize',  bool,   True,               "Whether to enable memory optimize.")
+    add_arg('best_acc5',        float,  0.93,               "The best acc5, default is 93%.")
+    # yapf: enable
+    args = parser.parse_args()
+    return args
+
+def get_device_num():
+    import subprocess
+    visible_device = os.getenv('CUDA_VISIBLE_DEVICES')
+    if visible_device:
+        device_num = len(visible_device.split(','))
+    else:
+        device_num = subprocess.check_output(
+            ['nvidia-smi', '-L']).decode().count('\n')
+    return device_num
+
+DEVICE_NUM = get_device_num()
+
+def test_parallel(exe, test_args, args, test_reader, feeder, bs):
+    acc_evaluators = []
+    for i in xrange(len(test_args[2])):
+        acc_evaluators.append(fluid.metrics.Accuracy())
+
+    to_fetch = [v.name for v in test_args[2]]
+    batch_id = 0
+    start_ts = time.time()
+    for batch_id, data in enumerate(test_reader()):
+        acc_rets = exe.run(fetch_list=to_fetch, feed=feeder.feed(data))
+        ret_result = [np.mean(np.array(ret)) for ret in acc_rets]
+        print("Test batch: [%d], acc_rets: [%s]" % (batch_id, ret_result))
+        for i, e in enumerate(acc_evaluators):
+            e.update(
+                value=np.array(acc_rets[i]), weight=bs)
+    num_samples = batch_id * bs * DEVICE_NUM
+    print_train_time(start_ts, time.time(), num_samples)
+
+    return [e.eval() for e in acc_evaluators]
+
+
+def build_program(args, is_train, main_prog, startup_prog, py_reader_startup_prog, sz, trn_dir, bs, min_scale, rect_val=False):
+
+    dshape=[3, sz, sz]
+    class_dim=1000
+    pyreader = None
+    with fluid.program_guard(main_prog, startup_prog):
+        with fluid.unique_name.guard():
+            if is_train:
+                with fluid.program_guard(main_prog, py_reader_startup_prog):
+                    with fluid.unique_name.guard():
+                        pyreader = fluid.layers.py_reader(
+                            capacity=bs * DEVICE_NUM,
+                            shapes=([-1] + dshape, (-1, 1)),
+                            dtypes=('uint8', 'int64'),
+                            name="train_reader_" + str(sz) if is_train else "test_reader_" + str(sz),
+                            use_double_buffer=True)
+                input, label = fluid.layers.read_file(pyreader)
+            else:
+                input = fluid.layers.data(name="image", shape=[3, 244, 244], dtype="uint8")
+                label = fluid.layers.data(name="label", shape=[1], dtype="int64")
+            cast_img_type = "float16" if args.fp16 else "float32"
+            cast = fluid.layers.cast(input, cast_img_type)
+            img_mean = fluid.layers.create_global_var([3, 1, 1], 0.0, cast_img_type, name="img_mean", persistable=True)
+            img_std = fluid.layers.create_global_var([3, 1, 1], 0.0, cast_img_type, name="img_std", persistable=True)
+            # image = (image - (mean * 255.0)) / (std * 255.0)
+            t1 = fluid.layers.elementwise_sub(cast, img_mean, axis=1)
+            t2 = fluid.layers.elementwise_div(t1, img_std, axis=1)
+
+            model = FastImageNet(is_train=is_train)
+            predict = model.net(t2, class_dim=class_dim, img_size=sz)
+            cost, pred = fluid.layers.softmax_with_cross_entropy(predict, label, return_softmax=True)
+            if args.scale_loss > 1:
+                avg_cost = fluid.layers.mean(x=cost) * float(args.scale_loss)
+            else:
+                avg_cost = fluid.layers.mean(x=cost)
+
+            batch_acc1 = fluid.layers.accuracy(input=pred, label=label, k=1)
+            batch_acc5 = fluid.layers.accuracy(input=pred, label=label, k=5)
+
+            # configure optimize
+            optimizer = None
+            if is_train:
+                total_images = args.total_images
+                lr = args.lr
+
+                epochs = [(0,7), (7,13), (13, 22), (22, 25), (25, 28)]
+                bs_epoch = [bs*DEVICE_NUM for bs in [224, 224, 96, 96, 50]]
+                bs_scale = [bs*1.0 / bs_epoch[0] for bs in bs_epoch]
+                lrs = [(lr, lr*2), (lr*2, lr/4), (lr*bs_scale[2], lr/10*bs_scale[2]), (lr/10*bs_scale[2], lr/100*bs_scale[2]), (lr/100*bs_scale[4], lr/1000*bs_scale[4]), lr/1000*bs_scale[4]]
+
+                boundaries, values = lr_decay(lrs, epochs, bs_epoch, total_images)
+
+                optimizer = fluid.optimizer.Momentum(
+                    learning_rate=fluid.layers.piecewise_decay(boundaries=boundaries, values=values),
+                    momentum=0.9)
+                if args.fp16:
+                    params_grads = optimizer.backward(avg_cost)
+                    master_params_grads = utils.create_master_params_grads(
+                        params_grads, main_prog, startup_prog, args.scale_loss)
+                    optimizer.apply_gradients(master_params_grads)
+                    utils.master_param_to_train_param(master_params_grads, params_grads, main_prog)
+                else:
+                    optimizer.minimize(avg_cost)
+
+                if args.memory_optimize:
+                    fluid.memory_optimize(main_prog, skip_grads=True)
+
+    return avg_cost, optimizer, [batch_acc1, batch_acc5], pyreader
+
+
+def refresh_program(args, epoch, sz, trn_dir, bs, val_bs, need_update_start_prog=False, min_scale=0.08, rect_val=False):
+    print('refresh program: epoch: [%d], image size: [%d], trn_dir: [%s], batch_size:[%d]' % (epoch, sz, trn_dir, bs))
+    train_prog = fluid.Program()
+    test_prog = fluid.Program()
+    startup_prog = fluid.Program()
+    py_reader_startup_prog = fluid.Program()
+
+    train_args = build_program(args, True, train_prog, startup_prog, py_reader_startup_prog, sz, trn_dir, bs, min_scale)
+    test_args = build_program(args, False, test_prog, startup_prog, py_reader_startup_prog, sz, trn_dir, val_bs, min_scale, rect_val=rect_val)
+
+    place = core.CUDAPlace(0)
+    startup_exe = fluid.Executor(place)
+    startup_exe.run(py_reader_startup_prog)
+
+    if need_update_start_prog:
+        startup_exe.run(startup_prog)
+        conv2d_w_vars = [var for var in startup_prog.global_block().vars.values() if var.name.startswith('conv2d_')]
+        for var in conv2d_w_vars:
+            torch_w = torch.empty(var.shape)
+            kaiming_np = torch.nn.init.kaiming_normal_(torch_w, mode='fan_out', nonlinearity='relu').numpy()
+            tensor = fluid.global_scope().find_var(var.name).get_tensor()
+            if args.fp16:
+                tensor.set(np.array(kaiming_np, dtype="float16").view(np.uint16), place)
+            else:
+                tensor.set(np.array(kaiming_np, dtype="float32"), place)
+
+        np_tensors = {}
+        np_tensors["img_mean"] = np.array([0.485 * 255.0, 0.456 * 255.0, 0.406 * 255.0]).astype("float16" if args.fp16 else "float32").reshape((3, 1, 1))
+        np_tensors["img_std"] = np.array([0.229 * 255.0, 0.224 * 255.0, 0.225 * 255.0]).astype("float16" if args.fp16 else "float32").reshape((3, 1, 1))
+        for vname, np_tensor in np_tensors.items():
+            var = fluid.global_scope().find_var(vname)
+            if args.fp16:
+                var.get_tensor().set(np_tensor.view(np.uint16), place)
+            else:
+                var.get_tensor().set(np_tensor, place)
+
+
+    strategy = fluid.ExecutionStrategy()
+    strategy.num_threads = args.num_threads
+    strategy.allow_op_delay = False
+    strategy.num_iteration_per_drop_scope = 1
+    build_strategy = fluid.BuildStrategy()
+    build_strategy.reduce_strategy = fluid.BuildStrategy().ReduceStrategy.AllReduce
+
+    avg_loss = train_args[0]
+    train_exe = fluid.ParallelExecutor(
+        True,
+        avg_loss.name,
+        main_program=train_prog,
+        exec_strategy=strategy,
+        build_strategy=build_strategy)
+    test_exe = fluid.ParallelExecutor(
+        True, main_program=test_prog, share_vars_from=train_exe)
+
+    return train_args, test_args, test_prog, train_exe, test_exe
+
+def prepare_reader(epoch_id, train_py_reader, train_bs, val_bs, trn_dir, img_dim, min_scale, rect_val):
+    train_reader = torchvision_reader.train(
+                traindir="/data/imagenet/%strain" % trn_dir, sz=img_dim, min_scale=min_scale, shuffle_seed=epoch_id+1)
+    train_py_reader.decorate_paddle_reader(paddle.batch(train_reader, batch_size=train_bs))
+
+    test_reader = torchvision_reader.test(
+                valdir="/data/imagenet/%svalidation" % trn_dir, bs=val_bs*DEVICE_NUM, sz=img_dim, rect_val=rect_val)
+    test_batched_reader = paddle.batch(test_reader, batch_size=val_bs * DEVICE_NUM)
+
+    return test_batched_reader
+
+
+def train_parallel(args):
+    over_all_start = time.time()
+    test_prog = fluid.Program()
+
+    exe = None
+    test_exe = None
+    train_args = None
+    test_args = None
+    ## dynamic batch size, image size...
+    bs = 224
+    val_bs = 64
+    trn_dir = "sz/160/"
+    img_dim=128
+    min_scale=0.08
+    rect_val=False
+    for epoch_id in range(args.num_epochs):
+        # refresh program
+        if epoch_id == 0:
+            train_args, test_args, test_prog, exe, test_exe = refresh_program(args, epoch_id, sz=img_dim, trn_dir=trn_dir, bs=bs, val_bs=val_bs, need_update_start_prog=True)
+        elif epoch_id == 13: #13
+            bs = 96
+            trn_dir="sz/352/"
+            img_dim=224
+            min_scale=0.087
+            train_args, test_args, test_prog, exe, test_exe = refresh_program(args, epoch_id, sz=img_dim, trn_dir=trn_dir, bs=bs, val_bs=val_bs, min_scale=min_scale)
+        elif epoch_id == 25: #25
+            bs = 50
+            val_bs=8
+            trn_dir=""
+            img_dim=288
+            min_scale=0.5
+            rect_val=True
+            train_args, test_args, test_prog, exe, test_exe = refresh_program(args, epoch_id, sz=img_dim, trn_dir=trn_dir, bs=bs, val_bs=val_bs, min_scale=min_scale, rect_val=rect_val)
+        else:
+            pass
+
+        avg_loss = train_args[0]
+        num_samples = 0
+        iters = 0
+        start_time = time.time()
+        train_py_reader = train_args[3]
+        test_reader = prepare_reader(epoch_id, train_py_reader, bs, val_bs, trn_dir, img_dim=img_dim, min_scale=min_scale, rect_val=rect_val)
+        train_py_reader.start() # start pyreader
+        batch_start_time = time.time()
+        while True:
+            fetch_list = [avg_loss.name]
+            acc_name_list = [v.name for v in train_args[2]]
+            fetch_list.extend(acc_name_list)
+            fetch_list.append("learning_rate")
+            if iters % args.log_period == 0:
+                should_print = True
+            else:
+                should_print = False
+
+            fetch_ret = []
+            try:
+                if should_print:
+                    fetch_ret = exe.run(fetch_list)
+                else:
+                    exe.run([])
+            except fluid.core.EOFException as eof:
+                print("Finish current epoch, will reset pyreader...")
+                train_py_reader.reset()
+                break
+            except fluid.core.EnforceNotMet as ex:
+                traceback.print_exc()
+                exit(1)
+
+            num_samples += bs * DEVICE_NUM
+
+            if should_print:
+                fetched_data = [np.mean(np.array(d)) for d in fetch_ret]
+                print("Epoch %d, batch %d, loss %s, accucacys: %s, learning_rate %s, py_reader queue_size: %d, avg batch time: %0.4f secs" %
+                      (epoch_id, iters, fetched_data[0], fetched_data[1:-1], fetched_data[-1], train_py_reader.queue.size(), (time.time() - batch_start_time)*1.0/args.log_period))
+                batch_start_time = time.time()
+            iters += 1
+
+        print_train_time(start_time, time.time(), num_samples)
+        feed_list = [test_prog.global_block().var(varname) for varname in ("image", "label")]
+        test_feeder = fluid.DataFeeder(feed_list=feed_list, place=fluid.CUDAPlace(0))
+        test_ret = test_parallel(test_exe, test_args, args, test_reader, test_feeder, val_bs)
+        test_acc1, test_acc5 = [np.mean(np.array(v)) for v in test_ret]
+        print("Epoch: %d, Test Accuracy: %s, Spend %.2f hours\n" %
+            (epoch_id, [test_acc1, test_acc5], (time.time() - over_all_start) / 3600))
+        if np.mean(np.array(test_ret[1])) > args.best_acc5:
+            print("Achieve the best top-1 acc %f, top-5 acc: %f" % (test_acc1, test_acc5))
+            break
+
+    print("total train time: ", time.time() - over_all_start)
+
+
+def print_train_time(start_time, end_time, num_samples):
+    train_elapsed = end_time - start_time
+    examples_per_sec = num_samples / train_elapsed
+    print('\nTotal examples: %d, total time: %.5f, %.5f examples/sed\n' %
+          (num_samples, train_elapsed, examples_per_sec))
+
+
+def print_paddle_envs():
+    print('----------- Configuration envs -----------')
+    print("DEVICE_NUM: %d" % DEVICE_NUM)
+    for k in os.environ:
+        if "PADDLE_" in k:
+            print "ENV %s:%s" % (k, os.environ[k])
+    print('------------------------------------------------')
+
+
+def main():
+    args = parse_args()
+    print_arguments(args)
+    print_paddle_envs()
+    train_parallel(args)
+
+
+if __name__ == "__main__":
+    main()
\ No newline at end of file

fluid/PaddleCV/image_classification/models/__init__.py

@@ -9,3 +9,4 @@ from .inception_v4 import InceptionV4
 from .se_resnext import SE_ResNeXt50_32x4d, SE_ResNeXt101_32x4d, SE_ResNeXt152_32x4d
 from .dpn import DPN68, DPN92, DPN98, DPN107, DPN131
 from .shufflenet_v2 import ShuffleNetV2_x0_5, ShuffleNetV2_x1_0, ShuffleNetV2_x1_5, ShuffleNetV2_x2_0
+from .fast_imagenet import FastImageNet 

fluid/PaddleCV/image_classification/models/fast_imagenet.py

+#   Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed 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.
+
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
+import functools
+import numpy as np
+import time
+import os
+import math
+
+import cProfile, pstats, StringIO
+
+import paddle
+import paddle.fluid as fluid
+import paddle.fluid.core as core
+import paddle.fluid.profiler as profiler
+import utils
+
+__all__ = ["FastImageNet"]
+
+class FastImageNet():
+    def __init__(self, layers=50, is_train=True):
+        self.layers = layers
+        self.is_train = is_train
+
+    def net(self, input, class_dim=1000, img_size=224, is_train=True):
+        layers = self.layers
+        supported_layers = [50, 101, 152]
+        assert layers in supported_layers, \
+            "supported layers are {} but input layer is {}".format(supported_layers, layers)
+
+        if layers == 50:
+            depth = [3, 4, 6, 3]
+        elif layers == 101:
+            depth = [3, 4, 23, 3]
+        elif layers == 152:
+            depth = [3, 8, 36, 3]
+        num_filters = [64, 128, 256, 512]
+
+        conv = self.conv_bn_layer(
+            input=input, num_filters=64, filter_size=7, stride=2, act='relu')
+        conv = fluid.layers.pool2d(
+            input=conv,
+            pool_size=3,
+            pool_stride=2,
+            pool_padding=1,
+            pool_type='max')
+
+        for block in range(len(depth)):
+            for i in range(depth[block]):
+                conv = self.bottleneck_block(
+                    input=conv,
+                    num_filters=num_filters[block],
+                    stride=2 if i == 0 and block != 0 else 1)
+        pool_size = int(img_size / 32)
+        pool = fluid.layers.pool2d(
+            input=conv, pool_size=pool_size, pool_type='avg', global_pooling=True)
+        out = fluid.layers.fc(input=pool,
+                              size=class_dim,
+                              act=None,
+                              param_attr=fluid.param_attr.ParamAttr(
+                                  initializer=fluid.initializer.NormalInitializer(0.0, 0.01),
+                                  regularizer=fluid.regularizer.L2Decay(1e-4)),
+                              bias_attr=fluid.ParamAttr(
+                                  regularizer=fluid.regularizer.L2Decay(1e-4)))
+        return out
+
+    def conv_bn_layer(self,
+                      input,
+                      num_filters,
+                      filter_size,
+                      stride=1,
+                      groups=1,
+                      act=None,
+                      bn_init_value=1.0):
+        conv = fluid.layers.conv2d(
+            input=input,
+            num_filters=num_filters,
+            filter_size=filter_size,
+            stride=stride,
+            padding=(filter_size - 1) // 2,
+            groups=groups,
+            act=None,
+            bias_attr=False,
+            param_attr=fluid.ParamAttr(regularizer=fluid.regularizer.L2Decay(1e-4)))
+        return fluid.layers.batch_norm(input=conv, act=act, is_test=not self.is_train,
+            param_attr=fluid.param_attr.ParamAttr(
+                initializer=fluid.initializer.Constant(bn_init_value),
+                regularizer=None))
+
+    def shortcut(self, input, ch_out, stride):
+        ch_in = input.shape[1]
+        if ch_in != ch_out or stride != 1:
+            return self.conv_bn_layer(input, ch_out, 1, stride)
+        else:
+            return input
+
+    def bottleneck_block(self, input, num_filters, stride):
+        conv0 = self.conv_bn_layer(
+            input=input, num_filters=num_filters, filter_size=1, act='relu')
+        conv1 = self.conv_bn_layer(
+            input=conv0,
+            num_filters=num_filters,
+            filter_size=3,
+            stride=stride,
+            act='relu')
+        # init bn-weight0
+        conv2 = self.conv_bn_layer(
+            input=conv1, num_filters=num_filters * 4, filter_size=1, act=None, bn_init_value=0.0)
+
+        short = self.shortcut(input, num_filters * 4, stride)
+
+        return fluid.layers.elementwise_add(x=short, y=conv2, act='relu')
+
+def lr_decay(lrs, epochs, bs, total_image):
+    boundaries = []
+    values = []
+    for idx, epoch in enumerate(epochs):
+        step = total_image // bs[idx]
+        if step * bs[idx] < total_image:
+            step += 1
+        ratio = (lrs[idx][1] - lrs[idx][0])*1.0 / (epoch[1] - epoch[0])
+        lr_base = lrs[idx][0]
+        for s in xrange(epoch[0], epoch[1]):
+            if boundaries:
+                boundaries.append(boundaries[-1] + step + 1)
+            else:
+                boundaries = [step]
+            lr = lr_base + ratio * (s - epoch[0])
+            values.append(lr)
+            print("epoch: [%d], steps: [%d], lr: [%f]" % (s, boundaries[-1], values[-1])) 
+    values.append(lrs[-1])
+    print("epoch: [%d:], steps: [%d:], lr:[%f]" % (epochs[-1][-1], boundaries[-1], values[-1]))
+    return boundaries, values