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from .plot import *
from abcli import file
from abcli import string
import numpy as np
import matplotlib.pyplot as plt
import abcli.logging
import logging
logger = logging.getLogger(__name__)
class Image_Classifier(object):
def __init__(self):
self.class_names = []
self.model = None
self.params = {"convnet": False}
self.object_name = ""
self.model_size = ""
def load(self, model_path):
success, self.class_names = file.load_json(f"{model_path}/class_names.json")
if not success:
return False
success, self.params = file.load_json(f"{model_path}/params.json", default={})
if not success:
return False
self.model_size = file.size(f"{model_path}/image_classifier/model")
try:
self.model = tf.keras.models.load_model(
f"{model_path}/image_classifier/model"
)
except:
from abcli.logging import crash_report
crash_report("image_classifier.load({}) failed".format(model_path))
return False
self.window_size = int(
cache.read("{}.window_size".format(path.name(model_path)))
)
logger.info(
"{}.load({}x{}:{}): {}{} class(es): {}".format(
self.__class__.__name__,
self.window_size,
self.window_size,
path.name(model_path),
"convnet - " if self.params["convnet"] else "",
len(self.class_names),
",".join(self.class_names),
)
)
self.model.summary()
self.object_name = path.name(model_path)
return True
def predict(self, test_images, test_labels, output_path="", options=""):
options = Options(options).default("cache", False).default("page_count", -1)
logger.info(
"image_classifier.predict({},{}){}".format(
string.pretty_size_of_matrix(test_images),
string.pretty_size_of_matrix(test_labels),
"-> {}".format(output_path) if output_path else "",
)
)
prediction_time = time.time()
predictions = self.model.predict(test_images)
prediction_time = (time.time() - prediction_time) / test_images.shape[0]
logger.info(
"image_classifier.predict(): {} / frame".format(
string.pretty_duration(prediction_time, include_ms=True)
)
)
if not output_path:
return True
if not file.save("{}/predictions.pyndarray".format(output_path), predictions):
return False
if test_labels is not None:
from sklearn.metrics import confusion_matrix
logger.info("image_classifier.predict(): rendering confusion_matrix...")
cm = confusion_matrix(
test_labels,
np.argmax(predictions, axis=1),
labels=range(len(self.class_names)),
# normalize="true",
)
cm = cm / np.sum(cm, axis=1)[:, np.newaxis]
logger.debug("confusion_matrix: {}".format(cm))
if options["cache"]:
if not cache.write("{}.confusion_matrix".format(self.object_name), cm):
return False
if not file.save("{}/confusion_matrix.pyndarray".format(output_path), cm):
return False
if not graphics.render_confusion_matrix(
cm,
self.class_names,
"{}/Data/0/info.jpg".format(output_path),
{
"header": [
" | ".join(host.signature()),
" | ".join(objects.signature()),
],
"footer": self.signature(prediction_time),
},
):
return False
if test_labels is not None:
logger.info(
"image_classifier.predict(): rendering test_labels distribution..."
)
# accepting the risk that if test_labels does not contain any of the largest index
# this function will return False.
distribution = np.bincount(test_labels)
distribution = distribution / np.sum(distribution)
if not graphics.render_distribution(
distribution,
self.class_names,
"{}/Data/1/info.jpg".format(output_path),
{
"header": [
" | ".join(host.signature()),
" | ".join(objects.signature()),
],
"footer": self.signature(prediction_time),
"title": "distribution of test_labels",
},
):
return False
max_index = test_images.shape[0]
if options["page_count"] != -1:
max_index = min(24 * options["page_count"], max_index)
offset = int(np.max(np.array(objects.list_of_frames(output_path) + [-1]))) + 1
logger.info(
"image_classifier.predict(offset={}): rendering {} frame(s)...".format(
offset, max_index
)
)
for index in tqdm(range(0, max_index, 24)):
self.render(
predictions[index : index + 24],
None if test_labels is None else test_labels[index : index + 24],
test_images[index : index + 24],
"{}/Data/{}/info.jpg".format(output_path, int(index / 24) + offset),
prediction_time,
)
return True
def predict_frame(self, frame):
prediction_time = time.time()
try:
prediction = self.model.predict(
np.expand_dims(
cv2.resize(frame, (self.window_size, self.window_size)) / 255.0,
axis=0,
)
)
except:
from abcli.logging import crash_report
crash_report("image_classifier.predict_frame() crashed.")
return False, -1
prediction_time = time.time() - prediction_time
output = np.argmax(prediction)
logger.info(
"image_classifier.prediction: [{}] -> {} - took {}".format(
",".join(
[
"{}:{:.2f}".format(class_name, value)
for class_name, value in zip(self.class_names, prediction[0])
]
),
self.class_names[output],
string.pretty_duration(
prediction_time,
include_ms=True,
short=True,
),
)
)
return True, output
def render(
self,
predictions,
test_labels,
test_images,
output_filename="",
prediction_time=0,
):
num_rows = 4
num_cols = 6
num_images = num_rows * num_cols
plt.figure(figsize=(2 * 2 * num_cols, 2 * num_rows))
for i in range(min(num_images, len(predictions))):
plt.subplot(num_rows, 2 * num_cols, 2 * i + 1)
plot_image(i, predictions[i], test_labels, test_images, self.class_names)
plt.subplot(num_rows, 2 * num_cols, 2 * i + 2)
plot_value_array(i, predictions[i], test_labels)
plt.tight_layout()
if output_filename:
filename_ = file.auxiliary("prediction", "png")
plt.savefig(filename_)
plt.close()
success, image = file.load_image(filename_)
if success:
image = graphics.add_signature(
image,
[" | ".join(host.signature()), " | ".join(objects.signature())],
self.signature(prediction_time),
)
file.save_image(output_filename, image)
def save(self, model_path):
model_filename = "{}/image_classifier/model".format(model_path)
file.prepare_for_saving(model_filename)
try:
self.model.save(model_filename)
logger.info("image_classifier.model -> {}".format(model_filename))
except:
from abcli.logging import crash_report
crash_report("image_classifier.save({}) failed".format(model_path))
return False
self.object_name = path.name(model_path)
self.model_size = file.size("{}/image_classifier/model".format(model_path))
if not file.save_json(
"{}/class_names.json".format(model_path), self.class_names
):
return False
if not file.save_json("{}/params.json".format(model_path), self.params):
return False
return True
def signature(self, prediction_time):
return [
" | ".join(
[
"image_classifier",
self.object_name,
string.pretty_bytes(self.model_size) if self.model_size else "",
string.pretty_size(self.input_shape),
"/".join(string.shorten(self.class_names)),
"took {} / frame".format(
string.pretty_duration(
prediction_time,
include_ms=True,
longest=True,
short=True,
)
),
]
)
]
@staticmethod
def train(data_path, model_path, options=""):
options = (
Options(options)
.default("color", False)
.default("convnet", True)
.default("epochs", 10)
)
classifier = image_classifier()
classifier.params["convnet"] = options["convnet"]
logger.info(
"image_classifier.train({}) -{}> {}".format(
data_path,
"convnet-" if classifier.params["convnet"] else "",
model_path,
)
)
success, train_images = file.load("{}/train_images.pyndarray".format(data_path))
if success:
success, train_labels = file.load(f"{data_path}/train_labels.pyndarray")
if success:
success, test_images = file.load(f"{data_path}/test_images.pyndarray")
if success:
success, test_labels = file.load(f"{data_path}/test_labels.pyndarray")
if success:
success, classifier.class_names = file.load_json(
f"{data_path}/class_names.json"
)
if not success:
return False
from tensorflow.keras.utils import to_categorical
train_labels = to_categorical(train_labels)
test_labels = to_categorical(test_labels)
window_size = train_images.shape[1]
input_shape = (
(window_size, window_size, 3)
if options["color"]
else (window_size, window_size, 1)
if options["convnet"]
else (window_size, window_size)
)
logger.info(f"input_shape:{string.pretty_size(input_shape)}")
if options["convnet"] and not options["color"]:
train_images = np.expand_dims(train_images, axis=3)
test_images = np.expand_dims(test_images, axis=3)
for name, thing in zip(
"train_images,train_labels,test_images,test_labels".split(","),
[train_images, train_labels, test_images, test_labels],
):
logger.info("{}: {}".format(name, string.pretty_size_of_matrix(thing)))
logger.info(
"{} class(es): {}".format(
len(classifier.class_names), classifier.class_names
)
)
train_images = train_images / 255.0
test_images = test_images / 255.0
if options["convnet"]:
# https://medium.com/swlh/convolutional-neural-networks-for-multiclass-image-classification-a-beginners-guide-to-6dbc09fabbd
classifier.model = tf.keras.Sequential(
[
tf.keras.layers.Conv2D(
filters=48,
kernel_size=3,
activation="relu",
input_shape=input_shape,
),
tf.keras.layers.MaxPool2D(pool_size=2, strides=2),
tf.keras.layers.Conv2D(
filters=48, kernel_size=3, activation="relu"
),
tf.keras.layers.MaxPool2D(pool_size=2, strides=2),
tf.keras.layers.Conv2D(
filters=32, kernel_size=3, activation="relu"
),
tf.keras.layers.MaxPool2D(pool_size=2, strides=2),
tf.keras.layers.Flatten(),
tf.keras.layers.Dense(128, activation="relu"),
tf.keras.layers.Dense(64, activation="relu"),
tf.keras.layers.Dense(len(classifier.class_names)),
tf.keras.layers.Activation("softmax"),
]
)
else:
# https://github.com/gato/tensor-on-pi/blob/master/Convolutional%20Neural%20Network%20digit%20predictor.ipynb
classifier.model = tf.keras.Sequential(
[
tf.keras.layers.Flatten(input_shape=input_shape),
tf.keras.layers.Dense(128, activation="relu"),
tf.keras.layers.Dense(len(classifier.class_names)),
tf.keras.layers.Activation("softmax"),
]
)
classifier.model.summary()
classifier.model.compile(
optimizer="adam",
loss=tf.keras.losses.categorical_crossentropy,
metrics=["accuracy"],
)
classifier.model.fit(train_images, train_labels, epochs=options["epochs"])
test_accuracy = float(
classifier.model.evaluate(test_images, test_labels, verbose=2)[1]
)
logger.info("test accuracy: {:.4f}".format(test_accuracy))
if not file.save_json(
f"{model_path}/eval.json",
{"metrics": {"test_accuracy": test_accuracy}},
):
return False
if not classifier.save(model_path):
return False
return classifier.predict(
test_images,
np.argmax(test_labels, axis=1),
model_path,
cache=True,
page_count=10,
)
@property
def input_shape(self):
return self.model.layers[0].input_shape[1:] if self.model.layers else []
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