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compute_scores.py
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from __future__ import division, print_function
import os.path, sys, tarfile
import numpy as np
from scipy import linalg
from six.moves import range, urllib
from sklearn.metrics.pairwise import polynomial_kernel
import tensorflow as tf
from tqdm import tqdm
# from tqdm docs: https://pypi.python.org/pypi/tqdm#hooks-and-callbacks
class TqdmUpTo(tqdm):
def update_to(self, b=1, bsize=1, tsize=None):
if tsize is not None:
self.total = tsize
self.update(b * bsize - self.n) # also sets self.n = b * bsize
class Inception(object):
def __init__(self):
MODEL_DIR = '/tmp/imagenet'
DATA_URL = ('http:https://download.tensorflow.org/models/image/imagenet/'
'inception-2015-12-05.tgz')
self.softmax_dim = 1008
self.coder_dim = 2048
if not os.path.exists(MODEL_DIR):
os.makedirs(MODEL_DIR)
filename = DATA_URL.split('/')[-1]
filepath = os.path.join(MODEL_DIR, filename)
if not os.path.exists(filepath):
with TqdmUpTo(unit='B', unit_scale=True, miniters=1,
desc=filename) as t:
filepath, _ = urllib.request.urlretrieve(
DATA_URL, filepath, reporthook=t.update_to)
tarfile.open(filepath, 'r:gz').extractall(MODEL_DIR)
with tf.gfile.FastGFile(os.path.join(
MODEL_DIR, 'classify_image_graph_def.pb'), 'rb') as f:
graph_def = tf.GraphDef()
graph_def.ParseFromString(f.read())
tf.import_graph_def(graph_def, name='')
# Works with an arbitrary minibatch size.
self.sess = sess = tf.Session()
#with sess:
pool3 = sess.graph.get_tensor_by_name('pool_3:0')
ops = pool3.graph.get_operations()
for op_idx, op in enumerate(ops):
for o in op.outputs:
shape = [s.value for s in o.get_shape()]
if len(shape) and shape[0] == 1:
shape[0] = None
o._shape = tf.TensorShape(shape)
w = sess.graph.get_operation_by_name(
"softmax/logits/MatMul").inputs[1]
self.coder = tf.squeeze(tf.squeeze(pool3, 2), 1)
logits = tf.matmul(self.coder, w)
self.softmax = tf.nn.softmax(logits)
assert self.coder.get_shape()[1].value == self.coder_dim
assert self.softmax.get_shape()[1].value == self.softmax_dim
self.input = 'ExpandDims:0'
class LeNet(object):
def __init__(self):
MODEL_DIR = 'lenet/saved_model'
self.softmax_dim = 10
self.coder_dim = 512
self.sess = sess = tf.Session()
tf.saved_model.loader.load(
sess, [tf.saved_model.tag_constants.TRAINING], MODEL_DIR)
g = sess.graph
self.softmax = g.get_tensor_by_name('Softmax_1:0')
self.coder = g.get_tensor_by_name('Relu_5:0')
assert self.coder.get_shape()[1].value == self.coder_dim
assert self.softmax.get_shape()[1].value == self.softmax_dim
self.input = 'Placeholder_2:0'
def featurize(images, model, batch_size=100, transformer=np.asarray,
get_preds=True, get_codes=False, output=sys.stdout,
out_preds=None, out_codes=None):
'''
images: a list of numpy arrays with values in [0, 255]
'''
sub = transformer(images[:10])
assert(sub.ndim == 4)
if isinstance(model, Inception):
assert sub.shape[3] == 3
if (sub.max() > 255) or (sub.min() < 0):
print('WARNING! Inception min/max violated: min = %f, max = %f. Clipping values.' % (sub.min(), sub.max()))
sub = sub.clip(0., 255.)
elif isinstance(model, LeNet):
batch_size = 64
assert sub.shape[3] == 1
if (sub.max() > .5) or (sub.min() < -.5):
print('WARNING! LeNet min/max violated: min = %f, max = %f. Clipping values.' % (sub.min(), sub.max()))
sub = sub.clip(-.5, .5)
n = len(images)
to_get = ()
ret = ()
if get_preds:
to_get += (model.softmax,)
if out_preds is not None:
assert out_preds.shape == (n, model.softmax_dim)
assert out_preds.dtype == np.float32
preds = out_preds
else:
preds = np.empty((n, model.softmax_dim), dtype=np.float32)
preds.fill(np.nan)
ret += (preds,)
if get_codes:
to_get += (model.coder,)
if out_codes is not None:
assert out_codes.shape == (n, model.coder_dim)
assert out_codes.dtype == np.float32
codes = out_codes
else:
codes = np.empty((n, model.coder_dim), dtype=np.float32)
codes.fill(np.nan)
ret += (codes,)
# with model.sess:
with TqdmUpTo(unit='img', unit_scale=True, total=n, file=output) as t:
for start in range(0, n, batch_size):
t.update_to(start)
end = min(start + batch_size, n)
inp = transformer(images[start:end])
if end - start != batch_size:
pad = batch_size - (end - start)
extra = np.zeros((pad,) + inp.shape[1:], dtype=inp.dtype)
inp = np.r_[inp, extra]
w = slice(0, end - start)
else:
w = slice(None)
out = model.sess.run(to_get, {model.input: inp})
if get_preds:
preds[start:end] = out[0][w]
if get_codes:
codes[start:end] = out[-1][w]
t.update_to(n)
return ret
def get_splits(n, splits=10, split_method='openai'):
if split_method == 'openai':
return [slice(i * n // splits, (i + 1) * n // splits)
for i in range(splits)]
elif split_method == 'bootstrap':
return [np.random.choice(n, n) for _ in range(splits)]
else:
raise ValueError("bad split_method {}".format(split_method))
def inception_score(preds, **split_args):
split_inds = get_splits(preds.shape[0], **split_args)
scores = np.zeros(len(split_inds))
for i, inds in enumerate(split_inds):
part = preds[inds]
kl = part * (np.log(part) - np.log(np.mean(part, 0, keepdims=True)))
kl = np.mean(np.sum(kl, 1))
scores[i] = np.exp(kl)
return scores
def fid_score(codes_g, codes_r, eps=1e-6, output=sys.stdout, **split_args):
splits_g = get_splits(codes_g.shape[0], **split_args)
splits_r = get_splits(codes_r.shape[0], **split_args)
assert len(splits_g) == len(splits_r)
d = codes_g.shape[1]
assert codes_r.shape[1] == d
scores = np.zeros(len(splits_g))
with tqdm(splits_g, desc='FID', file=output) as bar:
for i, (w_g, w_r) in enumerate(zip(bar, splits_r)):
part_g = codes_g[w_g]
part_r = codes_r[w_r]
mn_g = part_g.mean(axis=0)
mn_r = part_r.mean(axis=0)
cov_g = np.cov(part_g, rowvar=False)
cov_r = np.cov(part_r, rowvar=False)
covmean, _ = linalg.sqrtm(cov_g.dot(cov_r), disp=False)
if not np.isfinite(covmean).all():
cov_g[range(d), range(d)] += eps
cov_r[range(d), range(d)] += eps
covmean = linalg.sqrtm(cov_g.dot(cov_r))
scores[i] = np.sum((mn_g - mn_r) ** 2) + (
np.trace(cov_g) + np.trace(cov_r) - 2 * np.trace(covmean))
bar.set_postfix({'mean': scores[:i+1].mean()})
return scores
def polynomial_mmd_averages(codes_g, codes_r, n_subsets=50, subset_size=1000,
ret_var=True, output=sys.stdout, **kernel_args):
m = min(codes_g.shape[0], codes_r.shape[0])
mmds = np.zeros(n_subsets)
if ret_var:
vars = np.zeros(n_subsets)
choice = np.random.choice
with tqdm(range(n_subsets), desc='MMD', file=output) as bar:
for i in bar:
g = codes_g[choice(len(codes_g), subset_size, replace=False)]
r = codes_r[choice(len(codes_r), subset_size, replace=False)]
o = polynomial_mmd(g, r, **kernel_args, var_at_m=m, ret_var=ret_var)
if ret_var:
mmds[i], vars[i] = o
else:
mmds[i] = o
bar.set_postfix({'mean': mmds[:i+1].mean()})
return (mmds, vars) if ret_var else mmds
def polynomial_mmd(codes_g, codes_r, degree=3, gamma=None, coef0=1,
var_at_m=None, ret_var=True):
# use k(x, y) = (gamma <x, y> + coef0)^degree
# default gamma is 1 / dim
X = codes_g
Y = codes_r
K_XX = polynomial_kernel(X, degree=degree, gamma=gamma, coef0=coef0)
K_YY = polynomial_kernel(Y, degree=degree, gamma=gamma, coef0=coef0)
K_XY = polynomial_kernel(X, Y, degree=degree, gamma=gamma, coef0=coef0)
return _mmd2_and_variance(K_XX, K_XY, K_YY,
var_at_m=var_at_m, ret_var=ret_var)
def _sqn(arr):
flat = np.ravel(arr)
return flat.dot(flat)
def _mmd2_and_variance(K_XX, K_XY, K_YY, unit_diagonal=False,
mmd_est='unbiased', block_size=1024,
var_at_m=None, ret_var=True):
# based on
# https://github.com/dougalsutherland/opt-mmd/blob/master/two_sample/mmd.py
# but changed to not compute the full kernel matrix at once
m = K_XX.shape[0]
assert K_XX.shape == (m, m)
assert K_XY.shape == (m, m)
assert K_YY.shape == (m, m)
if var_at_m is None:
var_at_m = m
# Get the various sums of kernels that we'll use
# Kts drop the diagonal, but we don't need to compute them explicitly
if unit_diagonal:
diag_X = diag_Y = 1
sum_diag_X = sum_diag_Y = m
sum_diag2_X = sum_diag2_Y = m
else:
diag_X = np.diagonal(K_XX)
diag_Y = np.diagonal(K_YY)
sum_diag_X = diag_X.sum()
sum_diag_Y = diag_Y.sum()
sum_diag2_X = _sqn(diag_X)
sum_diag2_Y = _sqn(diag_Y)
Kt_XX_sums = K_XX.sum(axis=1) - diag_X
Kt_YY_sums = K_YY.sum(axis=1) - diag_Y
K_XY_sums_0 = K_XY.sum(axis=0)
K_XY_sums_1 = K_XY.sum(axis=1)
Kt_XX_sum = Kt_XX_sums.sum()
Kt_YY_sum = Kt_YY_sums.sum()
K_XY_sum = K_XY_sums_0.sum()
if mmd_est == 'biased':
mmd2 = ((Kt_XX_sum + sum_diag_X) / (m * m)
+ (Kt_YY_sum + sum_diag_Y) / (m * m)
- 2 * K_XY_sum / (m * m))
else:
assert mmd_est in {'unbiased', 'u-statistic'}
mmd2 = (Kt_XX_sum + Kt_YY_sum) / (m * (m-1))
if mmd_est == 'unbiased':
mmd2 -= 2 * K_XY_sum / (m * m)
else:
mmd2 -= 2 * (K_XY_sum - np.trace(K_XY)) / (m * (m-1))
if not ret_var:
return mmd2
Kt_XX_2_sum = _sqn(K_XX) - sum_diag2_X
Kt_YY_2_sum = _sqn(K_YY) - sum_diag2_Y
K_XY_2_sum = _sqn(K_XY)
dot_XX_XY = Kt_XX_sums.dot(K_XY_sums_1)
dot_YY_YX = Kt_YY_sums.dot(K_XY_sums_0)
m1 = m - 1
m2 = m - 2
zeta1_est = (
1 / (m * m1 * m2) * (
_sqn(Kt_XX_sums) - Kt_XX_2_sum + _sqn(Kt_YY_sums) - Kt_YY_2_sum)
- 1 / (m * m1)**2 * (Kt_XX_sum**2 + Kt_YY_sum**2)
+ 1 / (m * m * m1) * (
_sqn(K_XY_sums_1) + _sqn(K_XY_sums_0) - 2 * K_XY_2_sum)
- 2 / m**4 * K_XY_sum**2
- 2 / (m * m * m1) * (dot_XX_XY + dot_YY_YX)
+ 2 / (m**3 * m1) * (Kt_XX_sum + Kt_YY_sum) * K_XY_sum
)
zeta2_est = (
1 / (m * m1) * (Kt_XX_2_sum + Kt_YY_2_sum)
- 1 / (m * m1)**2 * (Kt_XX_sum**2 + Kt_YY_sum**2)
+ 2 / (m * m) * K_XY_2_sum
- 2 / m**4 * K_XY_sum**2
- 4 / (m * m * m1) * (dot_XX_XY + dot_YY_YX)
+ 4 / (m**3 * m1) * (Kt_XX_sum + Kt_YY_sum) * K_XY_sum
)
var_est = (4 * (var_at_m - 2) / (var_at_m * (var_at_m - 1)) * zeta1_est
+ 2 / (var_at_m * (var_at_m - 1)) * zeta2_est)
return mmd2, var_est
def main():
import argparse
parser = argparse.ArgumentParser()
parser.add_argument('samples')
parser.add_argument('reference_feats', nargs='?')
parser.add_argument('--output', '-o')
parser.add_argument('--reference-subset', default=slice(None),
type=lambda x: slice(*(int(s) if s else None
for s in x.split(':'))))
parser.add_argument('--batch-size', type=int, default=128)
parser.add_argument('--model', choices=['inception', 'lenet'],
default='inception')
g = parser.add_mutually_exclusive_group()
g.add_argument('--save-codes')
g.add_argument('--load-codes')
g = parser.add_mutually_exclusive_group()
g.add_argument('--save-preds')
g.add_argument('--load-preds')
g = parser.add_mutually_exclusive_group()
g.add_argument('--do-inception', action='store_true', default=True)
g.add_argument('--no-inception', action='store_false', dest='do_inception')
g = parser.add_mutually_exclusive_group()
g.add_argument('--do-fid', action='store_true', default=False)
g.add_argument('--no-fid', action='store_false', dest='do_fid')
g = parser.add_mutually_exclusive_group()
g.add_argument('--do-mmd', action='store_true', default=False)
g.add_argument('--no-mmd', action='store_false', dest='do_mmd')
parser.add_argument('--mmd-degree', type=int, default=3)
parser.add_argument('--mmd-gamma', type=float, default=None)
parser.add_argument('--mmd-coef0', type=float, default=1)
parser.add_argument('--mmd-subsets', type=int, default=100)
parser.add_argument('--mmd-subset-size', type=int, default=1000)
g = parser.add_mutually_exclusive_group()
g.add_argument('--mmd-var', action='store_true', default=False)
g.add_argument('--no-mmd-var', action='store_false', dest='mmd_var')
parser.add_argument('--splits', type=int, default=10)
parser.add_argument('--split-method', choices=['openai', 'bootstrap'],
default='bootstrap')
args = parser.parse_args()
if args.do_fid and args.reference_feats is None:
parser.error("Need REFERENCE_FEATS if you're doing FID")
def check_path(pth):
if os.path.exists(pth):
parser.error("Path {} already exists".format(pth))
d = os.path.dirname(pth)
if d and not os.path.exists(d):
os.makedirs(d)
if args.output:
check_path(args.output)
samples = np.load(args.samples, mmap_mode='r')
if args.model == 'inception':
model = Inception()
if samples.dtype == np.uint8:
transformer = np.asarray
elif samples.dtype == np.float32:
m = samples[:10].max()
assert .5 <= m <= 1
transformer = lambda x: x * 255
else:
raise TypeError("don't know how to handle {}".format(samples.dtype))
elif args.model == 'lenet':
model = LeNet()
if samples.dtype == np.uint8:
def transformer(x):
return (np.asarray(x, dtype=np.float32) - (255 / 2.)) / 255
elif samples.dtype == np.float32:
assert .8 <= samples[:10].max() <= 1
assert 0 <= samples[:10].min() <= .3
transformer = lambda x: x - .5
else:
raise TypeError("don't know how to handle {}".format(samples.dtype))
else:
raise ValueError("bad model {}".format(args.model))
if args.reference_feats:
ref_feats = np.load(args.reference_feats, mmap_mode='r')[
args.reference_subset]
out_kw = {}
if args.save_codes:
check_path(args.save_codes)
out_kw['out_codes'] = np.lib.format.open_memmap(
args.save_codes, mode='w+', dtype=np.float32,
shape=(samples.shape[0], model.coder_dim))
if args.save_preds:
check_path(args.save_preds)
out_kw['out_preds'] = np.lib.format.open_memmap(
args.save_preds, mode='w+', dtype=np.float32,
shape=(samples.shape[0], model.softmax_dim))
need_preds = args.do_inception or args.save_preds
need_codes = args.do_fid or args.do_mmd or args.save_codes
print('Transformer test: transformer([-1, 0, 10.]) = ' + repr(transformer(np.array([-1, 0, 10.]))))
if args.load_codes or args.load_preds:
if args.load_codes:
codes = np.load(args.load_codes, mmap_mode='r')
assert codes.ndim == 2
assert codes.shape[0] == samples.shape[0]
assert codes.shape[1] == model.coder_dim
if args.load_preds:
preds = np.load(args.load_preds, mmap_mode='r')
assert preds.ndim == 2
assert preds.shape[0] == samples.shape[0]
assert preds.shape[1] == model.softmax_dim
elif need_preds:
raise NotImplementedError()
else:
out = featurize(
samples, model, batch_size=args.batch_size, transformer=transformer,
get_preds=need_preds, get_codes=need_codes, **out_kw)
if need_preds:
preds = out[0]
if need_codes:
codes = out[-1]
split_args = {'splits': args.splits, 'split_method': args.split_method}
output = {'args': args}
if args.do_inception:
output['inception'] = scores = inception_score(preds, **split_args)
print("Inception mean:", np.mean(scores))
print("Inception std:", np.std(scores))
print("Inception scores:", scores, sep='\n')
if args.do_fid:
output['fid'] = scores = fid_score(codes, ref_feats, **split_args)
print("FID mean:", np.mean(scores))
print("FID std:", np.std(scores))
print("FID scores:", scores, sep='\n')
print()
if args.do_mmd:
ret = polynomial_mmd_averages(
codes, ref_feats, degree=args.mmd_degree, gamma=args.mmd_gamma,
coef0=args.mmd_coef0, ret_var=args.mmd_var,
n_subsets=args.mmd_subsets, subset_size=args.mmd_subset_size)
if args.mmd_var:
output['mmd2'], output['mmd2_var'] = mmd2s, vars = ret
else:
output['mmd2'] = mmd2s = ret
print("mean MMD^2 estimate:", mmd2s.mean())
print("std MMD^2 estimate:", mmd2s.std())
print("MMD^2 estimates:", mmd2s, sep='\n')
print()
if args.mmd_var:
print("mean Var[MMD^2] estimate:", vars.mean())
print("std Var[MMD^2] estimate:", vars.std())
print("Var[MMD^2] estimates:", vars, sep='\n')
print()
if args.output:
np.savez(args.output, **output)
if __name__ == '__main__':
main()