From 54db131db25f404a6d0df4417d90bbfb4382256e Mon Sep 17 00:00:00 2001
From: Michael Mandl <mandlm@molez.net>
Date: Sun, 30 Dec 2018 12:37:35 +0100
Subject: [PATCH] Split into two files, removed unused code

---
 flow.py  | 150 ++++++++++++++-----------------------------------------
 graph.py |  19 +++++++
 2 files changed, 56 insertions(+), 113 deletions(-)
 create mode 100644 graph.py

diff --git a/flow.py b/flow.py
index 2e774c1..6a119fd 100755
--- a/flow.py
+++ b/flow.py
@@ -1,128 +1,52 @@
 #!/usr/bin/python3
 
+"""My tensorflow keras playground"""
+
 import tensorflow as tf
 from tensorflow import keras
 
-import numpy as np
-import matplotlib.pyplot as plt
-
-import random
+from graph import plot_training_acc
 
 print("Running TensorFlow", tf.__version__)
 
-fashion_mnist = keras.datasets.fashion_mnist
 
-(train_images, train_labels), (test_images, test_labels) = fashion_mnist.load_data()
-
-train_images = train_images / 255.0
-test_images = test_images / 255.0
-
-class_names = [
-    "T-shirt/top",
-    "Trouser",
-    "Pullover",
-    "Dress",
-    "Coat",
-    "Sandal",
-    "Shirt",
-    "Sneaker",
-    "Bag",
-    "Ankle boot",
-]
-
-model = keras.Sequential(
-    [
-        keras.layers.Flatten(input_shape=(28, 28)),
-        keras.layers.Dense(256, activation=tf.nn.relu),
-        keras.layers.Dense(10, activation=tf.nn.softmax),
-    ]
-)
-
-model.compile(
-    optimizer=tf.train.AdamOptimizer(),
-    loss="sparse_categorical_crossentropy",
-    metrics=["accuracy"],
-)
-
-
-def plot_training(history):
-    acc = history.history["acc"]
-    val_acc = history.history["val_acc"]
-
-    epochs = range(1, len(acc) + 1)
-
-    plt.plot(epochs, acc, "bo", label="Training acc")
-    plt.plot(epochs, val_acc, "b", label="Validation acc")
-    plt.title("Training and validation accuracy")
-    plt.xlabel("Epochs")
-    plt.ylabel("Accuracy")
-    plt.legend()
-
-    plt.show()
-
-
-early_stop = keras.callbacks.EarlyStopping(monitor="val_loss", patience=5)
-
-history = model.fit(
-    train_images,
-    train_labels,
-    epochs=64,
-    batch_size=512,
-    validation_data=(test_images, test_labels),
-    callbacks=[early_stop],
-)
-
-plot_training(history)
-
-predictions = model.predict(test_images)
-
-
-def plot_image(i, predictions_array, true_label, img):
-    predictions_array, true_label, img = predictions_array[i], true_label[i], img[i]
-    plt.grid(False)
-    plt.xticks([])
-    plt.yticks([])
-
-    plt.imshow(img, cmap=plt.cm.binary)
-
-    predicted_label = np.argmax(predictions_array)
-    if predicted_label == true_label:
-        color = "blue"
-    else:
-        color = "red"
-
-    plt.xlabel(
-        "{} {:2.0f}% ({})".format(
-            class_names[predicted_label],
-            100 * np.max(predictions_array),
-            class_names[true_label],
-        ),
-        color=color,
+def model():
+    model = keras.Sequential(
+        [
+            keras.layers.Flatten(input_shape=(28, 28)),
+            keras.layers.Dense(128, activation=tf.nn.relu),
+            keras.layers.Dense(10, activation=tf.nn.softmax),
+        ]
     )
 
+    model.compile(
+        optimizer=tf.train.AdamOptimizer(),
+        loss="sparse_categorical_crossentropy",
+        metrics=["accuracy"],
+    )
 
-def plot_value_array(i, predictions_array, true_label):
-    predictions_array, true_label = predictions_array[i], true_label[i]
-    plt.grid(False)
-    plt.xticks([])
-    plt.yticks([])
-    thisplot = plt.bar(range(10), predictions_array, color="#777777")
-    plt.ylim([0, 1])
-    predicted_label = np.argmax(predictions_array)
-
-    thisplot[predicted_label].set_color("red")
-    thisplot[true_label].set_color("blue")
+    return model
 
 
-num_rows = 5
-num_cols = 5
-num_images = num_rows * num_cols
-plt.figure(figsize=(2 * 2 * num_cols, 2 * num_rows))
-for i in range(num_images):
-    image_idx = random.randint(0, len(test_images) - 1)
-    plt.subplot(num_rows, 2 * num_cols, 2 * i + 1)
-    plot_image(image_idx, predictions, test_labels, test_images)
-    plt.subplot(num_rows, 2 * num_cols, 2 * i + 2)
-    plot_value_array(image_idx, predictions, test_labels)
+if __name__ == "__main__":
+    fashion_mnist = keras.datasets.fashion_mnist
 
-plt.show()
+    (train_images, train_labels), (test_images, test_labels) = fashion_mnist.load_data()
+
+    train_images = train_images / 255.0
+    test_images = test_images / 255.0
+
+    model = model()
+
+    early_stop = keras.callbacks.EarlyStopping(monitor="val_loss", patience=5)
+
+    history = model.fit(
+        train_images,
+        train_labels,
+        epochs=64,
+        batch_size=1024,
+        validation_data=(test_images, test_labels),
+        callbacks=[early_stop],
+    )
+
+    plot_training_acc(history)
diff --git a/graph.py b/graph.py
new file mode 100644
index 0000000..485b978
--- /dev/null
+++ b/graph.py
@@ -0,0 +1,19 @@
+"""Tensorflow graphs"""
+
+import matplotlib.pyplot as plt
+
+def plot_training_acc(history):
+    """Plot training and validation accuracy"""
+    acc = history.history["acc"]
+    val_acc = history.history["val_acc"]
+
+    epochs = range(1, len(acc) + 1)
+
+    plt.plot(epochs, acc, "bo", label="Training acc")
+    plt.plot(epochs, val_acc, "b", label="Validation acc")
+    plt.title("Training and validation accuracy")
+    plt.xlabel("Epochs")
+    plt.ylabel("Accuracy")
+    plt.legend()
+
+    plt.show()