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core.py
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core.py
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import os, sys, time, shutil, tempfile, datetime, pathlib, subprocess
import logging
import numpy as np
from tqdm import trange, tqdm
from urllib.parse import urlparse
import tempfile
import cv2
from scipy.stats import mode
import fastremap
from . import transforms, dynamics, utils, plot, metrics
import torch
# from GPUtil import showUtilization as gpu_usage #for gpu memory debugging
from torch import nn
from torch.utils import mkldnn as mkldnn_utils
from . import resnet_torch
TORCH_ENABLED = True
core_logger = logging.getLogger(__name__)
tqdm_out = utils.TqdmToLogger(core_logger, level=logging.INFO)
def parse_model_string(pretrained_model):
if isinstance(pretrained_model, list):
model_str = os.path.split(pretrained_model[0])[-1]
else:
model_str = os.path.split(pretrained_model)[-1]
if len(model_str)>3 and model_str[:4]=='unet':
cp = False
nclasses = max(2, int(model_str[4]))
elif len(model_str)>7 and model_str[:8]=='cellpose':
cp = True
nclasses = 3
else:
return 3, True, True, False
if 'residual' in model_str and 'style' in model_str and 'concatentation' in model_str:
ostrs = model_str.split('_')[2::2]
residual_on = ostrs[0]=='on'
style_on = ostrs[1]=='on'
concatenation = ostrs[2]=='on'
return nclasses, residual_on, style_on, concatenation
else:
if cp:
return 3, True, True, False
else:
return nclasses, False, False, True
def use_gpu(gpu_number=0, use_torch=True):
""" check if gpu works """
if use_torch:
return _use_gpu_torch(gpu_number)
else:
raise ValueError('cellpose only runs with pytorch now')
def _use_gpu_torch(gpu_number=0):
try:
device = torch.device('cuda:' + str(gpu_number))
_ = torch.zeros([1, 2, 3]).to(device)
core_logger.info('** TORCH CUDA version installed and working. **')
return True
except:
core_logger.info('TORCH CUDA version not installed/working.')
return False
def assign_device(use_torch=True, gpu=False, device=0):
mac = False
cpu = True
if isinstance(device, str):
if device=='mps':
mac = True
else:
device = int(device)
if gpu and use_gpu(use_torch=True):
device = torch.device(f'cuda:{device}')
gpu=True
cpu=False
core_logger.info('>>>> using GPU')
elif mac:
try:
device = torch.device('mps')
gpu=True
core_logger.info('>>>> using GPU')
except:
cpu = True
gpu = False
if cpu:
device = torch.device('cpu')
core_logger.info('>>>> using CPU')
gpu=False
return device, gpu
def check_mkl(use_torch=True):
#core_logger.info('Running test snippet to check if MKL-DNN working')
mkl_enabled = torch.backends.mkldnn.is_available()
if mkl_enabled:
mkl_enabled = True
#core_logger.info('MKL version working - CPU version is sped up.')
else:
core_logger.info('WARNING: MKL version on torch not working/installed - CPU version will be slightly slower.')
core_logger.info('see https://pytorch.org/docs/stable/backends.html?highlight=mkl')
return mkl_enabled
class UnetModel():
def __init__(self, gpu=False, pretrained_model=False,
diam_mean=30., net_avg=False, device=None,
residual_on=False, style_on=False, concatenation=True,
nclasses=3, nchan=2):
self.unet = True
self.torch = True
self.mkldnn = None
if device is None:
sdevice, gpu = assign_device(self.torch, gpu)
self.device = device if device is not None else sdevice
if device is not None:
device_gpu = self.device.type=='cuda'
self.gpu = gpu if device is None else device_gpu
if not self.gpu:
self.mkldnn = check_mkl(True)
self.pretrained_model = pretrained_model
self.diam_mean = diam_mean
ostr = ['off', 'on']
self.net_type = 'unet{}_residual_{}_style_{}_concatenation_{}'.format(nclasses,
ostr[residual_on],
ostr[style_on],
ostr[concatenation])
if pretrained_model:
core_logger.info(f'u-net net type: {self.net_type}')
# create network
self.nclasses = nclasses
self.nbase = [32,64,128,256]
self.nchan = nchan
self.nbase = [nchan, 32, 64, 128, 256]
self.net = resnet_torch.CPnet(self.nbase,
self.nclasses,
sz=3,
residual_on=residual_on,
style_on=style_on,
concatenation=concatenation,
mkldnn=self.mkldnn,
diam_mean=diam_mean).to(self.device)
if pretrained_model is not None and isinstance(pretrained_model, str):
self.net.load_model(pretrained_model, cpu=(not self.gpu))
def eval(self, x, batch_size=8, channels=None, channels_last=False, invert=False, normalize=True,
rescale=None, do_3D=False, anisotropy=None, net_avg=False, augment=False,
channel_axis=None, z_axis=None, nolist=False,
tile=True, cell_threshold=None, boundary_threshold=None, min_size=15,
compute_masks=True):
""" segment list of images x
Parameters
----------
x: list or array of images
can be list of 2D/3D images, or array of 2D/3D images, or 4D image array
batch_size: int (optional, default 8)
number of 224x224 patches to run simultaneously on the GPU
(can make smaller or bigger depending on GPU memory usage)
channels: list (optional, default None)
list of channels, either of length 2 or of length number of images by 2.
First element of list is the channel to segment (0=grayscale, 1=red, 2=green, 3=blue).
Second element of list is the optional nuclear channel (0=none, 1=red, 2=green, 3=blue).
For instance, to segment grayscale images, input [0,0]. To segment images with cells
in green and nuclei in blue, input [2,3]. To segment one grayscale image and one
image with cells in green and nuclei in blue, input [[0,0], [2,3]].
channel_axis: int (optional, default None)
if None, channels dimension is attempted to be automatically determined
z_axis: int (optional, default None)
if None, z dimension is attempted to be automatically determined
invert: bool (optional, default False)
invert image pixel intensity before running network
normalize: bool (optional, default True)
normalize data so 0.0=1st percentile and 1.0=99th percentile of image intensities in each channel
rescale: float (optional, default None)
resize factor for each image, if None, set to 1.0
do_3D: bool (optional, default False)
set to True to run 3D segmentation on 4D image input
anisotropy: float (optional, default None)
for 3D segmentation, optional rescaling factor (e.g. set to 2.0 if Z is sampled half as dense as X or Y)
net_avg: bool (optional, default False)
runs the 4 built-in networks and averages them if True, runs one network if False
augment: bool (optional, default False)
tiles image with overlapping tiles and flips overlapped regions to augment
tile: bool (optional, default True)
tiles image to ensure GPU/CPU memory usage limited (recommended)
cell_threshold: float (optional, default 0.0)
cell probability threshold (all pixels with prob above threshold kept for masks)
boundary_threshold: float (optional, default 0.0)
cell probability threshold (all pixels with prob above threshold kept for masks)
min_size: int (optional, default 15)
minimum number of pixels per mask, can turn off with -1
Returns
-------
masks: list of 2D arrays, or single 3D array (if do_3D=True)
labelled image, where 0=no masks; 1,2,...=mask labels
flows: list of lists 2D arrays, or list of 3D arrays (if do_3D=True)
flows[k][0] = XY flow in HSV 0-255
flows[k][1] = flows at each pixel
flows[k][2] = the cell distance field
flows[k][3] = the cell boundary
styles: list of 1D arrays of length 64, or single 1D array (if do_3D=True)
style vector summarizing each image, also used to estimate size of objects in image
"""
x = [transforms.convert_image(xi, channels, channel_axis, z_axis, do_3D,
normalize, invert, nchan=self.nchan) for xi in x]
nimg = len(x)
self.batch_size = batch_size
styles = []
flows = []
masks = []
if rescale is None:
rescale = np.ones(nimg)
elif isinstance(rescale, float):
rescale = rescale * np.ones(nimg)
if nimg > 1:
iterator = trange(nimg, file=tqdm_out)
else:
iterator = range(nimg)
if isinstance(self.pretrained_model, list):
model_path = self.pretrained_model[0]
if not net_avg:
self.net.load_model(self.pretrained_model[0])
else:
model_path = self.pretrained_model
if cell_threshold is None or boundary_threshold is None:
try:
thresholds = np.load(model_path+'_cell_boundary_threshold.npy')
cell_threshold, boundary_threshold = thresholds
core_logger.info('>>>> found saved thresholds from validation set')
except:
core_logger.warning('WARNING: no thresholds found, using default / user input')
cell_threshold = 2.0 if cell_threshold is None else cell_threshold
boundary_threshold = 0.5 if boundary_threshold is None else boundary_threshold
if not do_3D:
for i in iterator:
img = x[i].copy()
shape = img.shape
# rescale image for flow computation
img = transforms.resize_image(img, rsz=rescale[i])
y, style = self._run_nets(img, net_avg=net_avg, augment=augment,
tile=tile)
if compute_masks:
maski = utils.get_masks_unet(y, cell_threshold, boundary_threshold)
maski = utils.fill_holes_and_remove_small_masks(maski, min_size=min_size)
maski = transforms.resize_image(maski, shape[-3], shape[-2],
interpolation=cv2.INTER_NEAREST)
else:
maski = None
masks.append(maski)
styles.append(style)
else:
for i in iterator:
tic=time.time()
yf, style = self._run_3D(x[i], rsz=rescale[i], anisotropy=anisotropy,
net_avg=net_avg, augment=augment, tile=tile)
yf = yf.mean(axis=0)
core_logger.info('probabilities computed %2.2fs'%(time.time()-tic))
if compute_masks:
maski = utils.get_masks_unet(yf.transpose((1,2,3,0)), cell_threshold, boundary_threshold)
maski = utils.fill_holes_and_remove_small_masks(maski, min_size=min_size)
else:
maski = None
masks.append(maski)
styles.append(style)
core_logger.info('masks computed %2.2fs'%(time.time()-tic))
flows.append(yf)
if nolist:
masks, flows, styles = masks[0], flows[0], styles[0]
return masks, flows, styles
def _to_device(self, x):
X = torch.from_numpy(x).float().to(self.device)
return X
def _from_device(self, X):
x = X.detach().cpu().numpy()
return x
def network(self, x, return_conv=False):
""" convert imgs to torch and run network model and return numpy """
X = self._to_device(x)
self.net.eval()
if self.mkldnn:
self.net = mkldnn_utils.to_mkldnn(self.net)
with torch.no_grad():
y, style = self.net(X)
del X
y = self._from_device(y)
style = self._from_device(style)
if return_conv:
conv = self._from_device(conv)
y = np.concatenate((y, conv), axis=1)
return y, style
def _run_nets(self, img, net_avg=False, augment=False, tile=True, tile_overlap=0.1, bsize=224,
return_conv=False, progress=None):
""" run network (if more than one, loop over networks and average results
Parameters
--------------
img: float, [Ly x Lx x nchan] or [Lz x Ly x Lx x nchan]
net_avg: bool (optional, default False)
runs the 4 built-in networks and averages them if True, runs one network if False
augment: bool (optional, default False)
tiles image with overlapping tiles and flips overlapped regions to augment
tile: bool (optional, default True)
tiles image to ensure GPU memory usage limited (recommended)
tile_overlap: float (optional, default 0.1)
fraction of overlap of tiles when computing flows
progress: pyqt progress bar (optional, default None)
to return progress bar status to GUI
Returns
------------------
y: array [3 x Ly x Lx] or [3 x Lz x Ly x Lx]
y is output (averaged over networks);
y[0] is Y flow; y[1] is X flow; y[2] is cell probability
style: array [64]
1D array summarizing the style of the image,
if tiled it is averaged over tiles,
but not averaged over networks.
"""
if isinstance(self.pretrained_model, str) or not net_avg:
y, style = self._run_net(img, augment=augment, tile=tile, tile_overlap=tile_overlap,
bsize=bsize, return_conv=return_conv)
else:
for j in range(len(self.pretrained_model)):
self.net.load_model(self.pretrained_model[j], cpu=(not self.gpu))
y0, style = self._run_net(img, augment=augment, tile=tile,
tile_overlap=tile_overlap, bsize=bsize,
return_conv=return_conv)
if j==0:
y = y0
else:
y += y0
if progress is not None:
progress.setValue(10 + 10*j)
y = y / len(self.pretrained_model)
return y, style
def _run_net(self, imgs, augment=False, tile=True, tile_overlap=0.1, bsize=224,
return_conv=False):
""" run network on image or stack of images
(faster if augment is False)
Parameters
--------------
imgs: array [Ly x Lx x nchan] or [Lz x Ly x Lx x nchan]
rsz: float (optional, default 1.0)
resize coefficient(s) for image
augment: bool (optional, default False)
tiles image with overlapping tiles and flips overlapped regions to augment
tile: bool (optional, default True)
tiles image to ensure GPU/CPU memory usage limited (recommended);
cannot be turned off for 3D segmentation
tile_overlap: float (optional, default 0.1)
fraction of overlap of tiles when computing flows
bsize: int (optional, default 224)
size of tiles to use in pixels [bsize x bsize]
Returns
------------------
y: array [Ly x Lx x 3] or [Lz x Ly x Lx x 3]
y[...,0] is Y flow; y[...,1] is X flow; y[...,2] is cell probability
style: array [64]
1D array summarizing the style of the image,
if tiled it is averaged over tiles
"""
if imgs.ndim==4:
# make image Lz x nchan x Ly x Lx for net
imgs = np.transpose(imgs, (0,3,1,2))
detranspose = (0,2,3,1)
return_conv = False
else:
# make image nchan x Ly x Lx for net
imgs = np.transpose(imgs, (2,0,1))
detranspose = (1,2,0)
# pad image for net so Ly and Lx are divisible by 4
imgs, ysub, xsub = transforms.pad_image_ND(imgs)
# slices from padding
# slc = [slice(0, self.nclasses) for n in range(imgs.ndim)] # changed from imgs.shape[n]+1 for first slice size
slc = [slice(0, imgs.shape[n]+1) for n in range(imgs.ndim)]
slc[-3] = slice(0, self.nclasses + 32*return_conv + 1)
slc[-2] = slice(ysub[0], ysub[-1]+1)
slc[-1] = slice(xsub[0], xsub[-1]+1)
slc = tuple(slc)
# run network
if tile or augment or imgs.ndim==4:
y, style = self._run_tiled(imgs, augment=augment, bsize=bsize,
tile_overlap=tile_overlap,
return_conv=return_conv)
else:
imgs = np.expand_dims(imgs, axis=0)
y, style = self.network(imgs, return_conv=return_conv)
y, style = y[0], style[0]
style /= (style**2).sum()**0.5
# slice out padding
y = y[slc]
# transpose so channels axis is last again
y = np.transpose(y, detranspose)
return y, style
def _run_tiled(self, imgi, augment=False, bsize=224, tile_overlap=0.1, return_conv=False):
""" run network in tiles of size [bsize x bsize]
First image is split into overlapping tiles of size [bsize x bsize].
If augment, tiles have 50% overlap and are flipped at overlaps.
The average of the network output over tiles is returned.
Parameters
--------------
imgi: array [nchan x Ly x Lx] or [Lz x nchan x Ly x Lx]
augment: bool (optional, default False)
tiles image with overlapping tiles and flips overlapped regions to augment
bsize: int (optional, default 224)
size of tiles to use in pixels [bsize x bsize]
tile_overlap: float (optional, default 0.1)
fraction of overlap of tiles when computing flows
Returns
------------------
yf: array [3 x Ly x Lx] or [Lz x 3 x Ly x Lx]
yf is averaged over tiles
yf[0] is Y flow; yf[1] is X flow; yf[2] is cell probability
styles: array [64]
1D array summarizing the style of the image, averaged over tiles
"""
if imgi.ndim==4:
batch_size = self.batch_size
Lz, nchan = imgi.shape[:2]
IMG, ysub, xsub, Ly, Lx = transforms.make_tiles(imgi[0], bsize=bsize,
augment=augment, tile_overlap=tile_overlap)
ny, nx, nchan, ly, lx = IMG.shape
batch_size *= max(4, (bsize**2 // (ly*lx))**0.5)
yf = np.zeros((Lz, self.nclasses, imgi.shape[-2], imgi.shape[-1]), np.float32)
styles = []
if ny*nx > batch_size:
ziterator = trange(Lz, file=tqdm_out)
for i in ziterator:
yfi, stylei = self._run_tiled(imgi[i], augment=augment,
bsize=bsize, tile_overlap=tile_overlap)
yf[i] = yfi
styles.append(stylei)
else:
# run multiple slices at the same time
ntiles = ny*nx
nimgs = max(2, int(np.round(batch_size / ntiles)))
niter = int(np.ceil(Lz/nimgs))
ziterator = trange(niter, file=tqdm_out)
for k in ziterator:
IMGa = np.zeros((ntiles*nimgs, nchan, ly, lx), np.float32)
for i in range(min(Lz-k*nimgs, nimgs)):
IMG, ysub, xsub, Ly, Lx = transforms.make_tiles(imgi[k*nimgs+i], bsize=bsize,
augment=augment, tile_overlap=tile_overlap)
IMGa[i*ntiles:(i+1)*ntiles] = np.reshape(IMG, (ny*nx, nchan, ly, lx))
ya, stylea = self.network(IMGa)
for i in range(min(Lz-k*nimgs, nimgs)):
y = ya[i*ntiles:(i+1)*ntiles]
if augment:
y = np.reshape(y, (ny, nx, 3, ly, lx))
y = transforms.unaugment_tiles(y, self.unet)
y = np.reshape(y, (-1, 3, ly, lx))
yfi = transforms.average_tiles(y, ysub, xsub, Ly, Lx)
yfi = yfi[:,:imgi.shape[2],:imgi.shape[3]]
yf[k*nimgs+i] = yfi
stylei = stylea[i*ntiles:(i+1)*ntiles].sum(axis=0)
stylei /= (stylei**2).sum()**0.5
styles.append(stylei)
return yf, np.array(styles)
else:
IMG, ysub, xsub, Ly, Lx = transforms.make_tiles(imgi, bsize=bsize,
augment=augment, tile_overlap=tile_overlap)
ny, nx, nchan, ly, lx = IMG.shape
IMG = np.reshape(IMG, (ny*nx, nchan, ly, lx))
batch_size = self.batch_size
niter = int(np.ceil(IMG.shape[0] / batch_size))
nout = self.nclasses + 32*return_conv
y = np.zeros((IMG.shape[0], nout, ly, lx))
for k in range(niter):
irange = np.arange(batch_size*k, min(IMG.shape[0], batch_size*k+batch_size))
y0, style = self.network(IMG[irange], return_conv=return_conv)
y[irange] = y0.reshape(len(irange), y0.shape[-3], y0.shape[-2], y0.shape[-1])
if k==0:
styles = style[0]
styles += style.sum(axis=0)
styles /= IMG.shape[0]
if augment:
y = np.reshape(y, (ny, nx, nout, bsize, bsize))
y = transforms.unaugment_tiles(y, self.unet)
y = np.reshape(y, (-1, nout, bsize, bsize))
yf = transforms.average_tiles(y, ysub, xsub, Ly, Lx)
yf = yf[:,:imgi.shape[1],:imgi.shape[2]]
styles /= (styles**2).sum()**0.5
return yf, styles
def _run_3D(self, imgs, rsz=1.0, anisotropy=None, net_avg=False,
augment=False, tile=True, tile_overlap=0.1,
bsize=224, progress=None):
""" run network on stack of images
(faster if augment is False)
Parameters
--------------
imgs: array [Lz x Ly x Lx x nchan]
rsz: float (optional, default 1.0)
resize coefficient(s) for image
anisotropy: float (optional, default None)
for 3D segmentation, optional rescaling factor (e.g. set to 2.0 if Z is sampled half as dense as X or Y)
net_avg: bool (optional, default False)
runs the 4 built-in networks and averages them if True, runs one network if False
augment: bool (optional, default False)
tiles image with overlapping tiles and flips overlapped regions to augment
tile: bool (optional, default True)
tiles image to ensure GPU/CPU memory usage limited (recommended);
cannot be turned off for 3D segmentation
tile_overlap: float (optional, default 0.1)
fraction of overlap of tiles when computing flows
bsize: int (optional, default 224)
size of tiles to use in pixels [bsize x bsize]
progress: pyqt progress bar (optional, default None)
to return progress bar status to GUI
Returns
------------------
yf: array [Lz x Ly x Lx x 3]
y[...,0] is Y flow; y[...,1] is X flow; y[...,2] is cell probability
style: array [64]
1D array summarizing the style of the image,
if tiled it is averaged over tiles
"""
sstr = ['YX', 'ZY', 'ZX']
if anisotropy is not None:
rescaling = [[rsz, rsz],
[rsz*anisotropy, rsz],
[rsz*anisotropy, rsz]]
else:
rescaling = [rsz] * 3
pm = [(0,1,2,3), (1,0,2,3), (2,0,1,3)]
ipm = [(3,0,1,2), (3,1,0,2), (3,1,2,0)]
yf = np.zeros((3, self.nclasses, imgs.shape[0], imgs.shape[1], imgs.shape[2]), np.float32)
for p in range(3 - 2*self.unet):
xsl = imgs.copy().transpose(pm[p])
# rescale image for flow computation
shape = xsl.shape
xsl = transforms.resize_image(xsl, rsz=rescaling[p])
# per image
core_logger.info('running %s: %d planes of size (%d, %d)'%(sstr[p], shape[0], shape[1], shape[2]))
y, style = self._run_nets(xsl, net_avg=net_avg, augment=augment, tile=tile,
bsize=bsize, tile_overlap=tile_overlap)
y = transforms.resize_image(y, shape[1], shape[2])
yf[p] = y.transpose(ipm[p])
if progress is not None:
progress.setValue(25+15*p)
return yf, style
def loss_fn(self, lbl, y):
""" loss function between true labels lbl and prediction y """
# if available set boundary pixels to 2
if lbl.shape[1]>1 and self.nclasses>2:
boundary = lbl[:,1]<=4
lbl = lbl[:,0]
lbl[boundary] *= 2
else:
lbl = lbl[:,0]
lbl = self._to_device(lbl).long()
loss = 8 * 1./self.nclasses * self.criterion(y, lbl)
return loss
def train(self, train_data, train_labels, train_files=None,
test_data=None, test_labels=None, test_files=None,
channels=None, normalize=True, save_path=None, save_every=100, save_each=False,
learning_rate=0.2, n_epochs=500, momentum=0.9, weight_decay=0.00001, batch_size=8,
nimg_per_epoch=None, min_train_masks=5, rescale=False, model_name=None):
""" train function uses 0-1 mask label and boundary pixels for training """
nimg = len(train_data)
train_data, train_labels, test_data, test_labels, run_test = transforms.reshape_train_test(train_data, train_labels,
test_data, test_labels,
channels, normalize)
train_labels = [fastremap.renumber(label, in_place=True)[0] for label in train_labels]
# add dist_to_bound to labels
if self.nclasses==3:
core_logger.info('computing boundary pixels for training data')
train_classes = [np.stack((label, label>0, utils.distance_to_boundary(label)), axis=0).astype(np.float32)
for label in tqdm(train_labels, file=tqdm_out)]
else:
train_classes = [np.stack((label, label>0), axis=0).astype(np.float32)
for label in tqdm(train_labels, file=tqdm_out)]
if run_test:
test_labels = [fastremap.renumber(label, in_place=True)[0] for label in test_labels]
if self.nclasses==3:
core_logger.info('computing boundary pixels for test data')
test_classes = [np.stack((label, label>0, utils.distance_to_boundary(label)), axis=0).astype(np.float32)
for label in tqdm(test_labels, file=tqdm_out)]
else:
test_classes = [np.stack((label, label>0), axis=0).astype(np.float32)
for label in tqdm(test_labels, file=tqdm_out)]
else:
test_classes = None
nmasks = np.array([label[0].max()-1 for label in train_classes])
nremove = (nmasks < min_train_masks).sum()
if nremove > 0:
core_logger.warning(f'{nremove} train images with number of masks less than min_train_masks ({min_train_masks}), removing from train set')
ikeep = np.nonzero(nmasks >= min_train_masks)[0]
train_data = [train_data[i] for i in ikeep]
train_classes = [train_classes[i] for i in ikeep]
train_labels = [train_labels[i] for i in ikeep]
# split train data into train and val
val_data = train_data[::8]
val_classes = train_classes[::8]
val_labels = train_labels[::8]
del train_data[::8], train_classes[::8], train_labels[::8]
model_path = self._train_net(train_data, train_classes, test_data, test_classes,
save_path=save_path, save_every=save_every, save_each=save_each,
learning_rate=learning_rate, n_epochs=n_epochs, momentum=momentum,
weight_decay=weight_decay, SGD=True, batch_size=batch_size,
nimg_per_epoch=nimg_per_epoch, rescale=rescale, model_name=model_name)
# find threshold using validation set
core_logger.info('>>>> finding best thresholds using validation set')
cell_threshold, boundary_threshold = self.threshold_validation(val_data, val_labels)
np.save(model_path+'_cell_boundary_threshold.npy', np.array([cell_threshold, boundary_threshold]))
return model_path
def threshold_validation(self, val_data, val_labels):
cell_thresholds = np.arange(-4.0, 4.25, 0.5)
if self.nclasses==3:
boundary_thresholds = np.arange(-2, 2.25, 1.0)
else:
boundary_thresholds = np.zeros(1)
aps = np.zeros((cell_thresholds.size, boundary_thresholds.size, 3))
for j,cell_threshold in enumerate(cell_thresholds):
for k,boundary_threshold in enumerate(boundary_thresholds):
masks = []
for data in val_data:
output,style = self._run_net(data.transpose(1,2,0), augment=False)
masks.append(utils.get_masks_unet(output, cell_threshold, boundary_threshold))
ap = metrics.average_precision(val_labels, masks)[0]
ap0 = ap.mean(axis=0)
aps[j,k] = ap0
if self.nclasses==3:
kbest = aps[j].mean(axis=-1).argmax()
else:
kbest = 0
if j%4==0:
core_logger.info('best threshold at cell_threshold = {} => boundary_threshold = {}, ap @ 0.5 = {}'.format(cell_threshold, boundary_thresholds[kbest],
aps[j,kbest,0]))
if self.nclasses==3:
jbest, kbest = np.unravel_index(aps.mean(axis=-1).argmax(), aps.shape[:2])
else:
jbest = aps.squeeze().mean(axis=-1).argmax()
kbest = 0
cell_threshold, boundary_threshold = cell_thresholds[jbest], boundary_thresholds[kbest]
core_logger.info('>>>> best overall thresholds: (cell_threshold = {}, boundary_threshold = {}); ap @ 0.5 = {}'.format(cell_threshold, boundary_threshold,
aps[jbest,kbest,0]))
return cell_threshold, boundary_threshold
def _train_step(self, x, lbl):
X = self._to_device(x)
self.optimizer.zero_grad()
#if self.gpu:
# self.net.train() #.cuda()
#else:
self.net.train()
y = self.net(X)[0]
del X
loss = self.loss_fn(lbl,y)
loss.backward()
train_loss = loss.item()
self.optimizer.step()
train_loss *= len(x)
return train_loss
def _test_eval(self, x, lbl):
X = self._to_device(x)
self.net.eval()
with torch.no_grad():
y, style = self.net(X)
del X
loss = self.loss_fn(lbl,y)
test_loss = loss.item()
test_loss *= len(x)
return test_loss
def _set_optimizer(self, learning_rate, momentum, weight_decay, SGD=False):
if SGD:
self.optimizer = torch.optim.SGD(self.net.parameters(), lr=learning_rate,
momentum=momentum, weight_decay=weight_decay)
else:
import torch_optimizer as optim # for RADAM optimizer
self.optimizer = optim.RAdam(self.net.parameters(), lr=learning_rate, betas=(0.95, 0.999), #changed to .95
eps=1e-08, weight_decay=weight_decay)
core_logger.info('>>> Using RAdam optimizer')
self.optimizer.current_lr = learning_rate
def _set_learning_rate(self, lr):
for param_group in self.optimizer.param_groups:
param_group['lr'] = lr
def _set_criterion(self):
if self.unet:
self.criterion = nn.CrossEntropyLoss(reduction='mean')
else:
self.criterion = nn.MSELoss(reduction='mean')
self.criterion2 = nn.BCEWithLogitsLoss(reduction='mean')
def _train_net(self, train_data, train_labels,
test_data=None, test_labels=None,
save_path=None, save_every=100, save_each=False,
learning_rate=0.2, n_epochs=500, momentum=0.9, weight_decay=0.00001,
SGD=True, batch_size=8, nimg_per_epoch=None, rescale=True, model_name=None):
""" train function uses loss function self.loss_fn in models.py"""
d = datetime.datetime.now()
self.n_epochs = n_epochs
if isinstance(learning_rate, (list, np.ndarray)):
if isinstance(learning_rate, np.ndarray) and learning_rate.ndim > 1:
raise ValueError('learning_rate.ndim must equal 1')
elif len(learning_rate) != n_epochs:
raise ValueError('if learning_rate given as list or np.ndarray it must have length n_epochs')
self.learning_rate = learning_rate
self.learning_rate_const = mode(learning_rate)[0][0]
else:
self.learning_rate_const = learning_rate
# set learning rate schedule
if SGD:
LR = np.linspace(0, self.learning_rate_const, 10)
if self.n_epochs > 250:
LR = np.append(LR, self.learning_rate_const*np.ones(self.n_epochs-100))
for i in range(10):
LR = np.append(LR, LR[-1]/2 * np.ones(10))
else:
LR = np.append(LR, self.learning_rate_const*np.ones(max(0,self.n_epochs-10)))
else:
LR = self.learning_rate_const * np.ones(self.n_epochs)
self.learning_rate = LR
self.batch_size = batch_size
self._set_optimizer(self.learning_rate[0], momentum, weight_decay, SGD)
self._set_criterion()
nimg = len(train_data)
# compute average cell diameter
diam_train = np.array([utils.diameters(train_labels[k][0])[0] for k in range(len(train_labels))])
diam_train_mean = diam_train[diam_train > 0].mean()
self.diam_labels = diam_train_mean
if rescale:
diam_train[diam_train<5] = 5.
if test_data is not None:
diam_test = np.array([utils.diameters(test_labels[k][0])[0] for k in range(len(test_labels))])
diam_test[diam_test<5] = 5.
scale_range = 0.5
core_logger.info('>>>> median diameter set to = %d'%self.diam_mean)
else:
scale_range = 1.0
core_logger.info(f'>>>> mean of training label mask diameters (saved to model) {diam_train_mean:.3f}')
self.net.diam_labels.data = torch.ones(1, device=self.device) * diam_train_mean
nchan = train_data[0].shape[0]
core_logger.info('>>>> training network with %d channel input <<<<'%nchan)
core_logger.info('>>>> LR: %0.5f, batch_size: %d, weight_decay: %0.5f'%(self.learning_rate_const, self.batch_size, weight_decay))
if test_data is not None:
core_logger.info(f'>>>> ntrain = {nimg}, ntest = {len(test_data)}')
else:
core_logger.info(f'>>>> ntrain = {nimg}')
tic = time.time()
lavg, nsum = 0, 0
if save_path is not None:
_, file_label = os.path.split(save_path)
file_path = os.path.join(save_path, 'models/')
if not os.path.exists(file_path):
os.makedirs(file_path)
else:
core_logger.warning('WARNING: no save_path given, model not saving')
ksave = 0
rsc = 1.0
# cannot train with mkldnn
self.net.mkldnn = False
# get indices for each epoch for training
np.random.seed(0)
inds_all = np.zeros((0,), 'int32')
if nimg_per_epoch is None or nimg > nimg_per_epoch:
nimg_per_epoch = nimg
core_logger.info(f'>>>> nimg_per_epoch = {nimg_per_epoch}')
while len(inds_all) < n_epochs * nimg_per_epoch:
rperm = np.random.permutation(nimg)
inds_all = np.hstack((inds_all, rperm))
for iepoch in range(self.n_epochs):
if SGD:
self._set_learning_rate(self.learning_rate[iepoch])
np.random.seed(iepoch)
rperm = inds_all[iepoch*nimg_per_epoch:(iepoch+1)*nimg_per_epoch]
for ibatch in range(0,nimg_per_epoch,batch_size):
inds = rperm[ibatch:ibatch+batch_size]
rsc = diam_train[inds] / self.diam_mean if rescale else np.ones(len(inds), np.float32)
# now passing in the full train array, need the labels for distance field
imgi, lbl, scale = transforms.random_rotate_and_resize(
[train_data[i] for i in inds], Y=[train_labels[i][1:] for i in inds],
rescale=rsc, scale_range=scale_range, unet=self.unet)
if self.unet and lbl.shape[1]>1 and rescale:
lbl[:,1] *= scale[:,np.newaxis,np.newaxis]**2#diam_batch[:,np.newaxis,np.newaxis]**2
train_loss = self._train_step(imgi, lbl)
lavg += train_loss
nsum += len(imgi)
if iepoch%10==0 or iepoch==5:
lavg = lavg / nsum
if test_data is not None:
lavgt, nsum = 0., 0
np.random.seed(42)
rperm = np.arange(0, len(test_data), 1, int)
for ibatch in range(0,len(test_data),batch_size):
inds = rperm[ibatch:ibatch+batch_size]
rsc = diam_test[inds] / self.diam_mean if rescale else np.ones(len(inds), np.float32)
imgi, lbl, scale = transforms.random_rotate_and_resize(
[test_data[i] for i in inds], Y=[test_labels[i][1:] for i in inds],
scale_range=0., rescale=rsc, unet=self.unet)
if self.unet and lbl.shape[1]>1 and rescale:
lbl[:,1] *= scale[:,np.newaxis,np.newaxis]**2
test_loss = self._test_eval(imgi, lbl)
lavgt += test_loss
nsum += len(imgi)
core_logger.info('Epoch %d, Time %4.1fs, Loss %2.4f, Loss Test %2.4f, LR %2.4f'%
(iepoch, time.time()-tic, lavg, lavgt/nsum, self.learning_rate[iepoch]))
else:
core_logger.info('Epoch %d, Time %4.1fs, Loss %2.4f, LR %2.4f'%
(iepoch, time.time()-tic, lavg, self.learning_rate[iepoch]))
lavg, nsum = 0, 0
if save_path is not None:
if iepoch==self.n_epochs-1 or iepoch%save_every==1:
# save model at the end
if save_each: #separate files as model progresses
if model_name is None:
file_name = '{}_{}_{}_{}'.format(self.net_type, file_label,
d.strftime("%Y_%m_%d_%H_%M_%S.%f"),
'epoch_'+str(iepoch))
else:
file_name = '{}_{}'.format(model_name, 'epoch_'+str(iepoch))
else:
if model_name is None:
file_name = '{}_{}_{}'.format(self.net_type, file_label, d.strftime("%Y_%m_%d_%H_%M_%S.%f"))
else:
file_name = model_name
file_name = os.path.join(file_path, file_name)
ksave += 1
core_logger.info(f'saving network parameters to {file_name}')
self.net.save_model(file_name)
else:
file_name = save_path
# reset to mkldnn if available
self.net.mkldnn = self.mkldnn
return file_name