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Commit ae989abc authored by Pengchong Jin's avatar Pengchong Jin Committed by A. Unique TensorFlower
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Internal change 

PiperOrigin-RevId: 282795425
parent ad3ff44b
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Showing with 50 additions and 377 deletions
official/vision/detection/configs/retinanet_config.py
View file @ ae989abc
......@@ -39,7 +39,7 @@ RETINANET_CFG = {
'optimizer': {
'type': 'momentum',
'momentum': 0.9,
'nesterov': False,
'nesterov': True,
},
'learning_rate': {
'type': 'step',
......@@ -166,7 +166,6 @@ RETINANET_CFG = {
'use_batched_nms': False,
'min_level': 3,
'max_level': 7,
'num_classes': 91,
'max_total_size': 100,
'nms_iou_threshold': 0.5,
'score_threshold': 0.05,
......@@ -182,7 +181,6 @@ RETINANET_RESTRICTIONS = [
'anchor.min_level == postprocess.min_level',
'anchor.max_level == postprocess.max_level',
'retinanet_head.num_classes == retinanet_loss.num_classes',
'retinanet_head.num_classes == postprocess.num_classes',
]
# pylint: enable=line-too-long
official/vision/detection/modeling/postprocess.py deleted 100644 → 0
View file @ ad3ff44b
# Copyright 2019 The TensorFlow 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.
# ==============================================================================
"""Post-processing model outputs to generate detection."""
from __future__ import absolute_import
from __future__ import division
# from __future__ import google_type_annotations
from __future__ import print_function
import functools
import tensorflow.compat.v2 as tf
from official.vision.detection.ops import nms
from official.vision.detection.utils import box_utils
def generate_detections_factory(params):
"""Factory to select function to generate detection."""
if params.use_batched_nms:
func = functools.partial(
_generate_detections_batched,
max_total_size=params.max_total_size,
nms_iou_threshold=params.nms_iou_threshold,
score_threshold=params.score_threshold)
else:
func = functools.partial(
_generate_detections,
max_total_size=params.max_total_size,
nms_iou_threshold=params.nms_iou_threshold,
score_threshold=params.score_threshold,
pre_nms_num_boxes=params.pre_nms_num_boxes)
return func
def _generate_detections(boxes,
scores,
max_total_size=100,
nms_iou_threshold=0.3,
score_threshold=0.05,
pre_nms_num_boxes=5000):
"""Generate the final detections given the model outputs.
This uses classes unrolling with while loop based NMS, could be parralled at batch dimension.
Args:
boxes: a tensor with shape [batch_size, N, num_classes, 4] or [batch_size,
N, 1, 4], which box predictions on all feature levels. The N is the number
of total anchors on all levels.
scores: a tensor with shape [batch_size, N, num_classes], which stacks class
probability on all feature levels. The N is the number of total anchors on
all levels. The num_classes is the number of classes predicted by the
model. Note that the class_outputs here is the raw score.
max_total_size: a scalar representing maximum number of boxes retained over
all classes.
nms_iou_threshold: a float representing the threshold for deciding whether
boxes overlap too much with respect to IOU.
score_threshold: a float representing the threshold for deciding when to
remove boxes based on score.
pre_nms_num_boxes: an int number of top candidate detections per class
before NMS.
Returns:
nms_boxes: `float` Tensor of shape [batch_size, max_total_size, 4]
representing top detected boxes in [y1, x1, y2, x2].
nms_scores: `float` Tensor of shape [batch_size, max_total_size]
representing sorted confidence scores for detected boxes. The values are
between [0, 1].
nms_classes: `int` Tensor of shape [batch_size, max_total_size] representing
classes for detected boxes.
valid_detections: `int` Tensor of shape [batch_size] only the top
`valid_detections` boxes are valid detections.
"""
with tf.name_scope('generate_detections'):
nmsed_boxes = []
nmsed_classes = []
nmsed_scores = []
valid_detections = []
batch_size, _, num_classes_for_box, _ = boxes.get_shape().as_list()
num_classes = scores.get_shape().as_list()[2]
for i in range(num_classes):
boxes_i = boxes[:, :, min(num_classes_for_box - 1, i), :]
scores_i = scores[:, :, i]
# Obtains pre_nms_num_boxes before running NMS.
scores_i, indices = tf.nn.top_k(
scores_i,
k=tf.minimum(tf.shape(input=scores_i)[-1], pre_nms_num_boxes))
boxes_i = tf.gather(boxes_i, indices, batch_dims=1, axis=1)
# Filter out scores.
boxes_i, scores_i = box_utils.filter_boxes_by_scores(
boxes_i, scores_i, min_score_threshold=score_threshold)
(nmsed_scores_i, nmsed_boxes_i) = nms.sorted_non_max_suppression_padded(
tf.cast(scores_i, tf.float32),
tf.cast(boxes_i, tf.float32),
max_total_size,
iou_threshold=nms_iou_threshold)
nmsed_classes_i = tf.fill([batch_size, max_total_size], i)
nmsed_boxes.append(nmsed_boxes_i)
nmsed_scores.append(nmsed_scores_i)
nmsed_classes.append(nmsed_classes_i)
nmsed_boxes = tf.concat(nmsed_boxes, axis=1)
nmsed_scores = tf.concat(nmsed_scores, axis=1)
nmsed_classes = tf.concat(nmsed_classes, axis=1)
nmsed_scores, indices = tf.nn.top_k(
nmsed_scores, k=max_total_size, sorted=True)
nmsed_boxes = tf.gather(nmsed_boxes, indices, batch_dims=1, axis=1)
nmsed_classes = tf.gather(nmsed_classes, indices, batch_dims=1)
valid_detections = tf.reduce_sum(
input_tensor=tf.cast(tf.greater(nmsed_scores, -1), tf.int32), axis=1)
return nmsed_boxes, nmsed_scores, nmsed_classes, valid_detections
def _generate_detections_per_image(boxes,
scores,
max_total_size=100,
nms_iou_threshold=0.3,
score_threshold=0.05,
pre_nms_num_boxes=5000):
"""Generate the final detections per image given the model outputs.
Args:
boxes: a tensor with shape [N, num_classes, 4] or [N, 1, 4], which box
predictions on all feature levels. The N is the number of total anchors on
all levels.
scores: a tensor with shape [N, num_classes], which stacks class probability
on all feature levels. The N is the number of total anchors on all levels.
The num_classes is the number of classes predicted by the model. Note that
the class_outputs here is the raw score.
max_total_size: a scalar representing maximum number of boxes retained over
all classes.
nms_iou_threshold: a float representing the threshold for deciding whether
boxes overlap too much with respect to IOU.
score_threshold: a float representing the threshold for deciding when to
remove boxes based on score.
pre_nms_num_boxes: an int number of top candidate detections per class
before NMS.
Returns:
nms_boxes: `float` Tensor of shape [max_total_size, 4] representing top
detected boxes in [y1, x1, y2, x2].
nms_scores: `float` Tensor of shape [max_total_size] representing sorted
confidence scores for detected boxes. The values are between [0, 1].
nms_classes: `int` Tensor of shape [max_total_size] representing classes for
detected boxes.
valid_detections: `int` Tensor of shape [1] only the top `valid_detections`
boxes are valid detections.
"""
nmsed_boxes = []
nmsed_scores = []
nmsed_classes = []
num_classes_for_box = boxes.get_shape().as_list()[1]
num_classes = scores.get_shape().as_list()[1]
for i in range(num_classes):
boxes_i = boxes[:, min(num_classes_for_box-1, i)]
scores_i = scores[:, i]
# Obtains pre_nms_num_boxes before running NMS.
scores_i, indices = tf.nn.top_k(
scores_i, k=tf.minimum(tf.shape(input=scores_i)[-1], pre_nms_num_boxes))
boxes_i = tf.gather(boxes_i, indices)
(nmsed_indices_i,
nmsed_num_valid_i) = tf.image.non_max_suppression_padded(
tf.cast(boxes_i, tf.float32),
tf.cast(scores_i, tf.float32),
max_total_size,
iou_threshold=nms_iou_threshold,
score_threshold=score_threshold,
pad_to_max_output_size=True,
name='nms_detections_' + str(i))
nmsed_boxes_i = tf.gather(boxes_i, nmsed_indices_i)
nmsed_scores_i = tf.gather(scores_i, nmsed_indices_i)
# Sets scores of invalid boxes to -1.
nmsed_scores_i = tf.where(
tf.less(tf.range(max_total_size), [nmsed_num_valid_i]), nmsed_scores_i,
-tf.ones_like(nmsed_scores_i))
nmsed_classes_i = tf.fill([max_total_size], i)
nmsed_boxes.append(nmsed_boxes_i)
nmsed_scores.append(nmsed_scores_i)
nmsed_classes.append(nmsed_classes_i)
# Concats results from all classes and sort them.
nmsed_boxes = tf.concat(nmsed_boxes, axis=0)
nmsed_scores = tf.concat(nmsed_scores, axis=0)
nmsed_classes = tf.concat(nmsed_classes, axis=0)
nmsed_scores, indices = tf.nn.top_k(
nmsed_scores,
k=max_total_size,
sorted=True)
nmsed_boxes = tf.gather(nmsed_boxes, indices)
nmsed_classes = tf.gather(nmsed_classes, indices)
valid_detections = tf.reduce_sum(
input_tensor=tf.cast(tf.greater(nmsed_scores, -1), tf.int32))
return nmsed_boxes, nmsed_scores, nmsed_classes, valid_detections
def _generate_detections_batched(boxes,
scores,
max_total_size,
nms_iou_threshold,
score_threshold):
"""Generates detected boxes with scores and classes for one-stage detector.
The function takes output of multi-level ConvNets and anchor boxes and
generates detected boxes. Note that this used batched nms, which is not
supported on TPU currently.
Args:
boxes: a tensor with shape [batch_size, N, num_classes, 4] or
[batch_size, N, 1, 4], which box predictions on all feature levels. The N
is the number of total anchors on all levels.
scores: a tensor with shape [batch_size, N, num_classes], which
stacks class probability on all feature levels. The N is the number of
total anchors on all levels. The num_classes is the number of classes
predicted by the model. Note that the class_outputs here is the raw score.
max_total_size: a scalar representing maximum number of boxes retained over
all classes.
nms_iou_threshold: a float representing the threshold for deciding whether
boxes overlap too much with respect to IOU.
score_threshold: a float representing the threshold for deciding when to
remove boxes based on score.
Returns:
nms_boxes: `float` Tensor of shape [batch_size, max_total_size, 4]
representing top detected boxes in [y1, x1, y2, x2].
nms_scores: `float` Tensor of shape [batch_size, max_total_size]
representing sorted confidence scores for detected boxes. The values are
between [0, 1].
nms_classes: `int` Tensor of shape [batch_size, max_total_size] representing
classes for detected boxes.
valid_detections: `int` Tensor of shape [batch_size] only the top
`valid_detections` boxes are valid detections.
"""
with tf.name_scope('generate_detections'):
# TODO(tsungyi): Removes normalization/denomalization once the
# tf.image.combined_non_max_suppression is coordinate system agnostic.
# Normalizes maximum box cooridinates to 1.
normalizer = tf.reduce_max(input_tensor=boxes)
boxes /= normalizer
(nmsed_boxes, nmsed_scores, nmsed_classes,
valid_detections) = tf.image.combined_non_max_suppression(
boxes,
scores,
max_output_size_per_class=max_total_size,
max_total_size=max_total_size,
iou_threshold=nms_iou_threshold,
score_threshold=score_threshold,
pad_per_class=False,)
# De-normalizes box cooridinates.
nmsed_boxes *= normalizer
return nmsed_boxes, nmsed_scores, nmsed_classes, valid_detections
def _apply_score_activation(logits, num_classes, activation):
"""Applies activation to logits and removes the background class.
Note that it is assumed that the background class has index 0, which is
sliced away after the score transformation.
Args:
logits: the raw logit tensor.
num_classes: the total number of classes including one background class.
activation: the score activation type, one of 'SIGMOID', 'SOFTMAX' and
'IDENTITY'.
Returns:
scores: the tensor after applying score transformation and background
class removal.
"""
batch_size = tf.shape(input=logits)[0]
logits = tf.reshape(logits, [batch_size, -1, num_classes])
if activation == 'SIGMOID':
scores = tf.sigmoid(logits)
elif activation == 'SOFTMAX':
scores = tf.softmax(logits)
elif activation == 'IDENTITY':
pass
else:
raise ValueError(
'The score activation should be SIGMOID, SOFTMAX or IDENTITY')
scores = scores[..., 1:]
return scores
class GenerateOneStageDetections(tf.keras.layers.Layer):
"""Generates detected boxes with scores and classes for one-stage detector."""
def __init__(self, params, **kwargs):
super(GenerateOneStageDetections, self).__init__(**kwargs)
self._generate_detections = generate_detections_factory(params)
self._min_level = params.min_level
self._max_level = params.max_level
self._num_classes = params.num_classes
self._score_activation = 'SIGMOID'
def call(self, inputs):
box_outputs, class_outputs, anchor_boxes, image_shape = inputs
# Collects outputs from all levels into a list.
boxes = []
scores = []
for i in range(self._min_level, self._max_level + 1):
batch_size = tf.shape(input=class_outputs[i])[0]
# Applies score transformation and remove the implicit background class.
scores_i = _apply_score_activation(
class_outputs[i], self._num_classes, self._score_activation)
# Box decoding.
# The anchor boxes are shared for all data in a batch.
# One stage detector only supports class agnostic box regression.
anchor_boxes_i = tf.reshape(anchor_boxes[i], [batch_size, -1, 4])
box_outputs_i = tf.reshape(box_outputs[i], [batch_size, -1, 4])
boxes_i = box_utils.decode_boxes(box_outputs_i, anchor_boxes_i)
# Box clipping.
boxes_i = box_utils.clip_boxes(boxes_i, image_shape)
boxes.append(boxes_i)
scores.append(scores_i)
boxes = tf.concat(boxes, axis=1)
scores = tf.concat(scores, axis=1)
boxes = tf.expand_dims(boxes, axis=2)
(nmsed_boxes, nmsed_scores, nmsed_classes,
valid_detections) = self._generate_detections(
tf.cast(boxes, tf.float32), tf.cast(scores, tf.float32))
# Adds 1 to offset the background class which has index 0.
nmsed_classes += 1
return nmsed_boxes, nmsed_scores, nmsed_classes, valid_detections
official/vision/detection/modeling/retinanet_model.py
View file @ ae989abc
......@@ -25,11 +25,11 @@ import tensorflow.compat.v2 as tf
from tensorflow.python.keras import backend
from official.vision.detection.dataloader import mode_keys
from official.vision.detection.evaluation import factory as eval_factory
from official.vision.detection.modeling import base_model
from official.vision.detection.modeling import losses
from official.vision.detection.modeling import postprocess
from official.vision.detection.modeling.architecture import factory
from official.vision.detection.evaluation import factory as eval_factory
from official.vision.detection.ops import postprocess_ops
class COCOMetrics(object):
......@@ -82,7 +82,7 @@ class RetinanetModel(base_model.Model):
self._keras_model = None
# Predict function.
self._generate_detections_fn = postprocess.GenerateOneStageDetections(
self._generate_detections_fn = postprocess_ops.MultilevelDetectionGenerator(
params.postprocess)
self._l2_weight_decay = params.train.l2_weight_decay
......@@ -169,8 +169,8 @@ class RetinanetModel(base_model.Model):
raise ValueError('"%s" is missing in outputs, requried %s found %s',
field, required_label_fields, labels.keys())
boxes, scores, classes, valid_detections = self._generate_detections_fn(
inputs=(outputs['box_outputs'], outputs['cls_outputs'],
labels['anchor_boxes'], labels['image_info'][:, 1:2, :]))
outputs['box_outputs'], outputs['cls_outputs'],
labels['anchor_boxes'], labels['image_info'][:, 1:2, :])
# Discards the old output tensors to save memory. The `cls_outputs` and
# `box_outputs` are pretty big and could potentiall lead to memory issue.
outputs = {
......
official/vision/detection/ops/postprocess_ops.py
View file @ ae989abc
......@@ -21,6 +21,7 @@ from __future__ import print_function
import functools
import tensorflow.compat.v2 as tf
from official.vision.detection.ops import nms
from official.vision.detection.utils import box_utils
......@@ -50,16 +51,17 @@ def _generate_detections(boxes,
pre_nms_num_boxes=5000):
"""Generate the final detections given the model outputs.
This uses batch unrolling, which is TPU compatible.
This uses classes unrolling with while loop based NMS, could be parralled
at batch dimension.
Args:
boxes: a tensor with shape [batch_size, N, num_classes, 4] or
[batch_size, N, 1, 4], which box predictions on all feature levels. The N
is the number of total anchors on all levels.
scores: a tensor with shape [batch_size, N, num_classes], which
stacks class probability on all feature levels. The N is the number of
total anchors on all levels. The num_classes is the number of classes
predicted by the model. Note that the class_outputs here is the raw score.
boxes: a tensor with shape [batch_size, N, num_classes, 4] or [batch_size,
N, 1, 4], which box predictions on all feature levels. The N is the number
of total anchors on all levels.
scores: a tensor with shape [batch_size, N, num_classes], which stacks class
probability on all feature levels. The N is the number of total anchors on
all levels. The num_classes is the number of classes predicted by the
model. Note that the class_outputs here is the raw score.
max_total_size: a scalar representing maximum number of boxes retained over
all classes.
nms_iou_threshold: a float representing the threshold for deciding whether
......@@ -81,28 +83,43 @@ def _generate_detections(boxes,
`valid_detections` boxes are valid detections.
"""
with tf.name_scope('generate_detections'):
batch_size = scores.get_shape().as_list()[0]
nmsed_boxes = []
nmsed_classes = []
nmsed_scores = []
valid_detections = []
for i in range(batch_size):
(nmsed_boxes_i, nmsed_scores_i, nmsed_classes_i,
valid_detections_i) = _generate_detections_per_image(
boxes[i],
scores[i],
batch_size, _, num_classes_for_box, _ = boxes.get_shape().as_list()
num_classes = scores.get_shape().as_list()[2]
for i in range(num_classes):
boxes_i = boxes[:, :, min(num_classes_for_box - 1, i), :]
scores_i = scores[:, :, i]
# Obtains pre_nms_num_boxes before running NMS.
scores_i, indices = tf.nn.top_k(
scores_i,
k=tf.minimum(tf.shape(input=scores_i)[-1], pre_nms_num_boxes))
boxes_i = tf.gather(boxes_i, indices, batch_dims=1, axis=1)
# Filter out scores.
boxes_i, scores_i = box_utils.filter_boxes_by_scores(
boxes_i, scores_i, min_score_threshold=score_threshold)
(nmsed_scores_i, nmsed_boxes_i) = nms.sorted_non_max_suppression_padded(
tf.cast(scores_i, tf.float32),
tf.cast(boxes_i, tf.float32),
max_total_size,
nms_iou_threshold,
score_threshold,
pre_nms_num_boxes)
iou_threshold=nms_iou_threshold)
nmsed_classes_i = tf.fill([batch_size, max_total_size], i)
nmsed_boxes.append(nmsed_boxes_i)
nmsed_scores.append(nmsed_scores_i)
nmsed_classes.append(nmsed_classes_i)
valid_detections.append(valid_detections_i)
nmsed_boxes = tf.stack(nmsed_boxes, axis=0)
nmsed_scores = tf.stack(nmsed_scores, axis=0)
nmsed_classes = tf.stack(nmsed_classes, axis=0)
valid_detections = tf.stack(valid_detections, axis=0)
nmsed_boxes = tf.concat(nmsed_boxes, axis=1)
nmsed_scores = tf.concat(nmsed_scores, axis=1)
nmsed_classes = tf.concat(nmsed_classes, axis=1)
nmsed_scores, indices = tf.nn.top_k(
nmsed_scores, k=max_total_size, sorted=True)
nmsed_boxes = tf.gather(nmsed_boxes, indices, batch_dims=1, axis=1)
nmsed_classes = tf.gather(nmsed_classes, indices, batch_dims=1)
valid_detections = tf.reduce_sum(
input_tensor=tf.cast(tf.greater(nmsed_scores, -1), tf.int32), axis=1)
return nmsed_boxes, nmsed_scores, nmsed_classes, valid_detections
......@@ -152,7 +169,7 @@ def _generate_detections_per_image(boxes,
# Obtains pre_nms_num_boxes before running NMS.
scores_i, indices = tf.nn.top_k(
scores_i, k=tf.minimum(tf.shape(scores_i)[-1], pre_nms_num_boxes))
scores_i, k=tf.minimum(tf.shape(input=scores_i)[-1], pre_nms_num_boxes))
boxes_i = tf.gather(boxes_i, indices)
(nmsed_indices_i,
......@@ -168,8 +185,8 @@ def _generate_detections_per_image(boxes,
nmsed_scores_i = tf.gather(scores_i, nmsed_indices_i)
# Sets scores of invalid boxes to -1.
nmsed_scores_i = tf.where(
tf.less(tf.range(max_total_size), [nmsed_num_valid_i]),
nmsed_scores_i, -tf.ones_like(nmsed_scores_i))
tf.less(tf.range(max_total_size), [nmsed_num_valid_i]), nmsed_scores_i,
-tf.ones_like(nmsed_scores_i))
nmsed_classes_i = tf.fill([max_total_size], i)
nmsed_boxes.append(nmsed_boxes_i)
nmsed_scores.append(nmsed_scores_i)
......@@ -184,7 +201,7 @@ def _generate_detections_per_image(boxes,
nmsed_boxes = tf.gather(nmsed_boxes, indices)
nmsed_classes = tf.gather(nmsed_classes, indices)
valid_detections = tf.reduce_sum(
tf.cast(tf.greater(nmsed_scores, -1), tf.int32))
input_tensor=tf.cast(tf.greater(nmsed_scores, -1), tf.int32))
return nmsed_boxes, nmsed_scores, nmsed_classes, valid_detections
......
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