make matplotlib an optional requirement

requirements/common.txt

@@ -1,2 +1 @@
-matplotlib
 numpy

requirements/plt.txt

@@ -0,0 +1,2 @@
+-r common.txt
+matplotlib

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = ccaptchas
-version = 0.1.0
+version = 0.1.1
 author = Daniil Fajnberg
 author_email = mail@daniil.fajnberg.de
 description = Character CAPTCHA Solver
@@ -19,12 +19,13 @@ package_dir =
 packages = find:
 python_requires = >=3.9
 install_requires =
-    matplotlib
     numpy
 
 [options.extras_require]
 dev =
     coverage
+plt =
+    matplotlib
 
 [options.packages.find]
 where = src

src/ccaptchas/infer.py

@@ -11,7 +11,6 @@ from keras.api._v2.keras.backend import ctc_decode
 from .config import CONFIG
 from .preprocess import process_image, decode_label, find_image_files, get_lookup_table
 from .types import PathT, ImgT, Array
-from .visualize import plot_images
 
 
 def process_predictions(predictions: tf.Tensor) -> tf.Tensor:
@@ -61,6 +60,7 @@ def load_and_infer(images: Sequence[ImgT], model_dir: PathT, plot_results: bool
     model, backward_lookup = load_inference_model(model_dir)
     images, labels = predict_and_decode(images, model, backward_lookup)
     if plot_results:
+        from .visualize import plot_images
         per_plot = 24
         for i in range(0, len(images), per_plot):
             plot_images(images[i:(i + per_plot)], labels=labels[i:(i + per_plot)])