From 5a2fb0139e5797a48afa1ca646a26c09c7a56936 Mon Sep 17 00:00:00 2001
From: Charles Cabergs <me@cacharle.xyz>
Date: Sat, 29 Aug 2020 17:49:39 +0200
Subject: Added logreg_predict

---
 src/logreg_predct.py  |  8 --------
 src/logreg_predict.py | 44 ++++++++++++++++++++++++++++++++++++++++++++
 src/logreg_train.py   |  6 +++---
 3 files changed, 47 insertions(+), 11 deletions(-)
 delete mode 100755 src/logreg_predct.py
 create mode 100755 src/logreg_predict.py

(limited to 'src')

diff --git a/src/logreg_predct.py b/src/logreg_predct.py
deleted file mode 100755
index 0f09c31..0000000
--- a/src/logreg_predct.py
+++ /dev/null
@@ -1,8 +0,0 @@
-#!/bin/python3
-
-import sys
-
-if __name__ == '__main__':
-    if len(sys.argv) != 2:
-        raise 'Usage: {} dataset_path'.path(sys.argv[0])
-
diff --git a/src/logreg_predict.py b/src/logreg_predict.py
new file mode 100755
index 0000000..9982c5b
--- /dev/null
+++ b/src/logreg_predict.py
@@ -0,0 +1,44 @@
+#!/bin/python3
+
+import sys
+
+import numpy as np
+
+from dataset import Dataset
+
+
+def sigmoid(x):
+    return 1.0 / (1.0 * np.exp(-x))
+
+def hypothesis(x, theta):
+    return sigmoid(x.dot(theta))
+
+if __name__ == '__main__':
+    if len(sys.argv) != 3:
+        raise 'Usage: {} dataset_path weights_path'.format(sys.argv[0])
+
+    labels = []
+    thetas = []
+    with open(sys.argv[2]) as f:
+        for line in f:
+            label_end = line.find(":")
+            labels.append(line[:label_end])
+            thetas.append(np.array([float(s) for s in line[label_end + 2:].split(",")]))
+    # print(labels)
+    # print(thetas)
+
+    d = Dataset(sys.argv[1])
+
+    X = d.df_scores
+    X = (X - X.min()) / (X.max() - X.min())
+    X = np.hstack([X, np.ones((X.shape[0], 1))])
+
+    with open("houses.csv", "w") as houses_file:
+        houses_file.write("Index,Hogwarts House\n")
+        for i, x in enumerate(X):
+            hs = []
+            for l, t in zip(labels, thetas):
+                hs.append((l, hypothesis(x, t)))
+
+            predicted, _ = max(hs, key=lambda x: x[1])
+            houses_file.write("{},{}\n".format(i, predicted))
diff --git a/src/logreg_train.py b/src/logreg_train.py
index e02e101..6254494 100755
--- a/src/logreg_train.py
+++ b/src/logreg_train.py
@@ -35,7 +35,7 @@ def train(ys, xs):
         ys_ally = ys.copy()
         ys_ally[ys == trained] = 0 # opposite?
         ys_ally[ys != trained] = 1
-        thetas.append((trained, gradient_descent(ys_ally, xs, 1, 2)))
+        thetas.append((trained, gradient_descent(ys_ally, xs, 1, 100)))
     return thetas
 
 if __name__ == '__main__':
@@ -51,5 +51,5 @@ if __name__ == '__main__':
     thetas = train(Y, X)
 
     with open("weights", "w") as f:
-        for name, t in thetas:
-            f.write("{}: {}\n".format(name, ','.join([str(x) for x in t])))
+        for label, t in thetas:
+            f.write("{}: {}\n".format(label, ','.join([str(x) for x in t])))
-- 
cgit