Merge commit 'd87691ec603db325d5b1c5db1186295a748df7cc' as 'subtree/rabit'

subtree/rabit/guide/basic.py

@@ -0,0 +1,25 @@
+#!/usr/bin/python
+"""
+demo python script of rabit
+"""
+import os
+import sys
+import numpy as np
+# import rabit, the tracker script will setup the lib path correctly
+# for normal run without tracker script, add following line
+# sys.path.append(os.path.dirname(__file__) + '/../wrapper')
+import rabit
+
+rabit.init()
+n = 3
+rank = rabit.get_rank()
+a = np.zeros(n)
+for i in xrange(n):
+    a[i] = rank + i
+    
+print '@node[%d] before-allreduce: a=%s' % (rank, str(a))
+a = rabit.allreduce(a, rabit.MAX)
+print '@node[%d] after-allreduce-max: a=%s' % (rank, str(a))
+a = rabit.allreduce(a, rabit.SUM)
+print '@node[%d] after-allreduce-sum: a=%s' % (rank, str(a))
+rabit.finalize()