Updates to Django 3.1

dq/tasks.py

@@ -0,0 +1,29 @@
+import numpy
+
+from django_q.tasks import async_iter, result
+
+
+# the estimation function
+def parzen_estimation(x_samples, point_x, h):
+    k_n = 0
+    for row in x_samples:
+        x_i = (point_x - row[:, numpy.newaxis]) / h
+        for row in x_i:
+            if numpy.abs(row) > (1 / 2):
+                break
+        else:
+            k_n += 1
+    return h, (k_n / len(x_samples)) / (h ** point_x.shape[1])
+
+
+def parzen_async():
+    mu_vec = numpy.array([0, 0])
+    cov_mat = numpy.array([[1, 0], [0, 1]])
+    sample = numpy.random.multivariate_normal(mu_vec, cov_mat, 10000)
+    widths = numpy.linspace(1.0, 1.2, 100)
+    x = numpy.array([[0], [0]])
+    # async_task them with async_task iterable
+    args = [(sample, x, w) for w in widths]
+    result_id = async_iter(parzen_estimation, args, cached=True)
+    # return the cached result or timeout after 10 seconds
+    return result(result_id, wait=10000, cached=True)