[SPARK-8032] [PYSPARK] Make version checking for NumPy in MLlib more robust

The current checking does version `1.x' is less than `1.4' this will fail if x has greater than 1 digit, since x > 4, however `1.x` < `1.4`

It fails in my system since I have version `1.10` :P

Author: MechCoder <[email protected]>

Closes apache#6579 from MechCoder/np_ver and squashes the following commits:

15430f8 [MechCoder] fix syntax error
893fb7e [MechCoder] remove equal to
e35f0d4 [MechCoder] minor
e89376c [MechCoder] Better checking
22703dd [MechCoder] [SPARK-8032] Make version checking for NumPy in MLlib more robust

Author: MechCoder

python/pyspark/mllib/__init__.py

@@ -23,7 +23,9 @@
 # MLlib currently needs NumPy 1.4+, so complain if lower
 
 import numpy
-if numpy.version.version < '1.4':
+
+ver = [int(x) for x in numpy.version.version.split('.')[:2]]
+if ver < [1, 4]:
     raise Exception("MLlib requires NumPy 1.4+")
 
 __all__ = ['classification', 'clustering', 'feature', 'fpm', 'linalg', 'random',