diff options
Diffstat (limited to 'python')
| -rw-r--r-- | python/pyspark/sql/dataframe.py | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/python/pyspark/sql/dataframe.py b/python/pyspark/sql/dataframe.py index d9cbbc68b3..3074af3ed2 100644 --- a/python/pyspark/sql/dataframe.py +++ b/python/pyspark/sql/dataframe.py @@ -426,7 +426,7 @@ class DataFrame(object): def sample(self, withReplacement, fraction, seed=None): """Returns a sampled subset of this :class:`DataFrame`. - >>> df.sample(False, 0.5, 97).count() + >>> df.sample(False, 0.5, 42).count() 1 """ assert fraction >= 0.0, "Negative fraction value: %s" % fraction @@ -434,6 +434,22 @@ class DataFrame(object): rdd = self._jdf.sample(withReplacement, fraction, long(seed)) return DataFrame(rdd, self.sql_ctx) + def randomSplit(self, weights, seed=None): + """Randomly splits this :class:`DataFrame` with the provided weights. + + >>> splits = df4.randomSplit([1.0, 2.0], 24) + >>> splits[0].count() + 1 + + >>> splits[1].count() + 3 + """ + for w in weights: + assert w >= 0.0, "Negative weight value: %s" % w + seed = seed if seed is not None else random.randint(0, sys.maxsize) + rdd_array = self._jdf.randomSplit(_to_seq(self.sql_ctx._sc, weights), long(seed)) + return [DataFrame(rdd, self.sql_ctx) for rdd in rdd_array] + @property def dtypes(self): """Returns all column names and their data types as a list. |