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load-resnet.py
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load-resnet.py
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#!/usr/bin/env python
# File: load-resnet.py
# Author: Eric Yujia Huang yujiah1@andrew.cmu.edu
# Yuxin Wu <ppwwyyxx@gmail.com>
import cv2
import functools
import tensorflow as tf
import argparse
import os
import re
import numpy as np
import six
from six.moves import zip
from tensorflow.contrib.layers import variance_scaling_initializer
from tensorpack import *
from tensorpack.utils import logger
from tensorpack.utils.stats import RatioCounter
from tensorpack.tfutils.summary import *
from tensorpack.dataflow.dataset import ILSVRCMeta, ILSVRC12
from imagenet_utils import eval_on_ILSVRC12, get_imagenet_dataflow, ImageNetModel
from resnet_model import resnet_group, resnet_bottleneck
DEPTH = None
CFG = {
50: ([3, 4, 6, 3]),
101: ([3, 4, 23, 3]),
152: ([3, 8, 36, 3])
}
class Model(ModelDesc):
def __init__(self, target_shape):
super(Model, self).__init__()
self.target_shape = target_shape
def _get_inputs(self):
return [InputDesc(tf.float32, [None, self.target_shape,
self.target_shape, 3], 'input'),
InputDesc(tf.int32, [None], 'label')]
def _build_graph(self, inputs):
image, label = inputs
blocks = CFG[DEPTH]
bottleneck = functools.partial(resnet_bottleneck, stride_first=True)
# tensorflow with padding=SAME will by default pad [2,3] here.
# but caffe conv with stride will pad [3,3]
image = tf.pad(image, [[0, 0], [3, 3], [3, 3], [0, 0]])
image = tf.transpose(image, [0, 3, 1, 2])
with argscope([Conv2D, MaxPooling, GlobalAvgPooling, BatchNorm],
data_format='NCHW'), \
argscope(Conv2D, nl=tf.identity, use_bias=False,
W_init=variance_scaling_initializer(mode='FAN_OUT')):
logits = (LinearWrap(image)
.Conv2D('conv0', 64, 7, stride=2, nl=BNReLU, padding='VALID')
.MaxPooling('pool0', shape=3, stride=2, padding='SAME')
.apply(resnet_group, 'group0', bottleneck, 64, blocks[0], 1)
.apply(resnet_group, 'group1', bottleneck, 128, blocks[1], 2)
.apply(resnet_group, 'group2', bottleneck, 256, blocks[2], 2)
.apply(resnet_group, 'group3', bottleneck, 512, blocks[3], 2)
.GlobalAvgPooling('gap')
.FullyConnected('linear', 1000, nl=tf.identity)())
prob = tf.nn.softmax(logits, name='prob')
ImageNetModel.compute_loss_and_error(logits, label)
def get_inference_augmentor(target_shape):
# load ResNet mean from Kaiming:
# from tensorpack.utils.loadcaffe import get_caffe_pb
# obj = get_caffe_pb().BlobProto()
# obj.ParseFromString(open('ResNet_mean.binaryproto').read())
# pp_mean_224 = np.array(obj.data).reshape(3, 224, 224).transpose(1,2,0)
meta = ILSVRCMeta()
pp_mean = meta.get_per_pixel_mean()
pp_mean_crop = pp_mean[16:-16, 16:-16, :]
transformers = [
imgaug.ResizeShortestEdge(256),
imgaug.CenterCrop((224, 224)),
imgaug.MapImage(lambda x: x - pp_mean_crop),
]
if target_shape != 224:
transformers.append(imgaug.ResizeShortestEdge(target_shape, cv2.INTER_CUBIC))
return transformers
def run_test(params, input, target_shape):
pred_config = PredictConfig(
model=Model(target_shape),
session_init=DictRestore(params),
input_names=['input'],
output_names=['prob']
)
predict_func = OfflinePredictor(pred_config)
prepro = imgaug.AugmentorList(get_inference_augmentor(target_shape))
im = cv2.imread(input).astype('float32')
im = prepro.augment(im)
im = np.reshape(im, (1, target_shape, target_shape, 3))
outputs = predict_func(im)
prob = outputs[0]
ret = prob[0].argsort()[-10:][::-1]
print(ret)
meta = ILSVRCMeta().get_synset_words_1000()
print([meta[k] for k in ret])
def name_conversion(caffe_layer_name):
""" Convert a caffe parameter name to a tensorflow parameter name as
defined in the above model """
# beginning & end mapping
NAME_MAP = {'bn_conv1/beta': 'conv0/bn/beta',
'bn_conv1/gamma': 'conv0/bn/gamma',
'bn_conv1/mean/EMA': 'conv0/bn/mean/EMA',
'bn_conv1/variance/EMA': 'conv0/bn/variance/EMA',
'conv1/W': 'conv0/W', 'conv1/b': 'conv0/b',
'fc1000/W': 'linear/W', 'fc1000/b': 'linear/b'}
if caffe_layer_name in NAME_MAP:
return NAME_MAP[caffe_layer_name]
s = re.search('([a-z]+)([0-9]+)([a-z]+)_', caffe_layer_name)
if s is None:
s = re.search('([a-z]+)([0-9]+)([a-z]+)([0-9]+)_', caffe_layer_name)
layer_block_part1 = s.group(3)
layer_block_part2 = s.group(4)
assert layer_block_part1 in ['a', 'b']
layer_block = 0 if layer_block_part1 == 'a' else int(layer_block_part2)
else:
layer_block = ord(s.group(3)) - ord('a')
layer_type = s.group(1)
layer_group = s.group(2)
layer_branch = int(re.search('_branch([0-9])', caffe_layer_name).group(1))
assert layer_branch in [1, 2]
if layer_branch == 2:
layer_id = re.search('_branch[0-9]([a-z])/', caffe_layer_name).group(1)
layer_id = ord(layer_id) - ord('a') + 1
TYPE_DICT = {'res': 'conv{}', 'bn': 'conv{}/bn'}
layer_type = TYPE_DICT[layer_type].format(layer_id if layer_branch == 2 else 'shortcut')
tf_name = caffe_layer_name[caffe_layer_name.index('/'):]
tf_name = 'group{}/block{}/{}'.format(
int(layer_group) - 2, layer_block, layer_type) + tf_name
return tf_name
def convert_param_name(param):
resnet_param = {}
for k, v in six.iteritems(param):
try:
newname = name_conversion(k)
except Exception:
logger.error("Exception when processing caffe layer {}".format(k))
raise
logger.info("Name Transform: " + k + ' --> ' + newname)
resnet_param[newname] = v
return resnet_param
if __name__ == '__main__':
parser = argparse.ArgumentParser()
parser.add_argument('--load', required=True,
help='.npy model file generated by tensorpack.utils.loadcaffe')
parser.add_argument('-d', '--depth', help='resnet depth', required=True, type=int, choices=[50, 101, 152])
parser.add_argument('--input', help='an input image')
parser.add_argument('--convert', help='npz output file to save the converted model')
parser.add_argument('--eval', help='ILSVRC dir to run validation on')
parser.add_argument('--image-size', choices=[224, 75],
help='image size to feed to resnet')
parser.add_argument('--dataset', choices=['val', 'train'])
args = parser.parse_args()
DEPTH = args.depth
param = np.load(args.load, encoding='latin1').item()
param = convert_param_name(param)
target_shape = args.image_size
if args.convert:
assert args.convert.endswith('.npz')
np.savez_compressed(args.convert, **param)
if args.eval:
ds = get_imagenet_dataflow(args.eval, args.dataset, 128,
get_inference_augmentor(target_shape))
eval_on_ILSVRC12(Model(target_shape), DictRestore(param), ds)
elif args.input:
run_test(param, args.input, target_shape)