From e8b48906e25a662d6bb1e848a6556609c97db9f1 Mon Sep 17 00:00:00 2001
From: Crista Lopes <crista@tagide.com>
Date: Thu, 2 Jan 2020 09:56:35 -0800
Subject: [PATCH] Added the learning counterpart of 37

---
 37-neuro-monolithic/tf-37-learning.py | 104 ++++++++++++++++++++++++++
 37-neuro-monolithic/tf-37.py          |   7 +-
 2 files changed, 107 insertions(+), 4 deletions(-)
 create mode 100644 37-neuro-monolithic/tf-37-learning.py

diff --git a/37-neuro-monolithic/tf-37-learning.py b/37-neuro-monolithic/tf-37-learning.py
new file mode 100644
index 0000000..90d1b1e
--- /dev/null
+++ b/37-neuro-monolithic/tf-37-learning.py
@@ -0,0 +1,104 @@
+from keras.models import Sequential
+from keras.layers import Dense
+from keras.losses import binary_crossentropy, categorical_crossentropy
+from keras.optimizers import SGD
+from keras. metrics import top_k_categorical_accuracy
+from keras import backend as K
+import numpy as np
+import sys, os, string, random
+
+characters = string.printable
+char_indices = dict((c, i) for i, c in enumerate(characters))
+indices_char = dict((i, c) for i, c in enumerate(characters))
+
+INPUT_VOCAB_SIZE = len(characters)
+LINE_SIZE = 80
+BATCH_SIZE = 200
+STEPS_PER_EPOCH = 5000
+EPOCHS = 4
+
+def encode_one_hot(line):
+    x = np.zeros((1, LINE_SIZE, INPUT_VOCAB_SIZE))
+    sp_idx = char_indices[' ']
+    for i, c in enumerate(line):
+        index = char_indices[c] if c in characters else sp_idx
+        x[0][i][index] = 1 
+    # Pad with spaces
+    for i in range(len(line), LINE_SIZE):
+        x[0][i][sp_idx] = 1 
+    return x.reshape([1, LINE_SIZE*INPUT_VOCAB_SIZE])
+
+def decode_one_hot(y):
+    s = []
+    x = y.reshape([1, LINE_SIZE, INPUT_VOCAB_SIZE])
+    for onehot in x[0]:
+        one_index = np.argmax(onehot) 
+        s.append(indices_char[one_index]) 
+    return ''.join(s)
+    
+def input_generator(nsamples):
+    def generate_line():
+        inline = []; outline = []
+        for _ in range(LINE_SIZE):
+            c = random.choice(characters) 
+            expected = c.lower() if c in string.ascii_letters else ' ' 
+            inline.append(c); outline.append(expected)
+        for i in range(LINE_SIZE):
+            if outline[i] == ' ': continue
+            if i > 0 and i < LINE_SIZE - 1:
+                outline[i] = ' ' if outline[i-1] == ' ' and outline[i+1] == ' ' else outline[i]
+            if (i == 0 and outline[i+1] == ' ') or (i == LINE_SIZE-1 and outline[i-1] == ' '):
+                outline[i] = ' '
+        return ''.join(inline), ''.join(outline)
+
+    while True:
+        data_in = np.zeros((nsamples, LINE_SIZE * INPUT_VOCAB_SIZE))
+        data_out = np.zeros((nsamples, LINE_SIZE * INPUT_VOCAB_SIZE))
+        for i in range(nsamples):
+            input_data, expected = generate_line()
+            data_in[i] = encode_one_hot(input_data)[0]
+            data_out[i] = encode_one_hot(expected)[0]
+        yield data_in, data_out
+
+def train(model):
+    model.compile(loss='binary_crossentropy',
+                  optimizer='adam',
+                  metrics=['accuracy'])
+    input_gen = input_generator(BATCH_SIZE)
+    validation_gen = input_generator(BATCH_SIZE)
+    model.fit_generator(input_gen,
+                epochs = EPOCHS, workers=1,
+                steps_per_epoch = STEPS_PER_EPOCH,
+                validation_data = validation_gen,
+                validation_steps = 10)
+
+def build_model():
+    # Normalize characters using a dense layer
+    model = Sequential()
+    model.add(Dense(LINE_SIZE*INPUT_VOCAB_SIZE, 
+                    input_shape=(LINE_SIZE*INPUT_VOCAB_SIZE,), 
+                    activation='sigmoid'))
+    return model
+
+def build_deep_model():
+    # Normalize characters using a dense layer
+    model = Sequential()
+    model.add(Dense(80, 
+                    input_shape=(LINE_SIZE*INPUT_VOCAB_SIZE,), 
+                    activation='sigmoid'))
+    model.add(Dense(800, activation='sigmoid'))
+    model.add(Dense(LINE_SIZE*INPUT_VOCAB_SIZE, activation='sigmoid'))
+    return model
+
+model = build_deep_model()
+model.summary()
+train(model)
+
+input("Network has been trained. Press <Enter> to run program.")
+with open(sys.argv[1]) as f:
+    for line in f:
+        if line.isspace(): continue
+        batch = encode_one_hot(line)
+        preds = model.predict(batch)
+        normal = decode_one_hot(preds)
+        print(normal)
\ No newline at end of file
diff --git a/37-neuro-monolithic/tf-37.py b/37-neuro-monolithic/tf-37.py
index 3351255..5e5bb00 100644
--- a/37-neuro-monolithic/tf-37.py
+++ b/37-neuro-monolithic/tf-37.py
@@ -69,10 +69,9 @@ def normalization_layer_set_weights(n_layer):
 def build_model():
     # Normalize characters using a dense layer
     model = Sequential()
-    dense_layer = Dense(LINE_SIZE*INPUT_VOCAB_SIZE, 
-                        input_shape=(LINE_SIZE*INPUT_VOCAB_SIZE,),
-                        activation='softmax')
-    model.add(dense_layer)
+    model.add(Dense(LINE_SIZE*INPUT_VOCAB_SIZE, 
+                    input_shape=(LINE_SIZE*INPUT_VOCAB_SIZE,),
+                    activation='sigmoid'))
     return model
 
 model = build_model()