turicreate.SFrame.apply¶

SFrame.
apply
(self, fn, dtype=None, seed=None)¶ Transform each row to an
SArray
according to a specified function. Returns a new SArray ofdtype
where each element in this SArray is transformed by fn(x) where x is a single row in the sframe represented as a dictionary. Thefn
should return exactly one value which can be cast into typedtype
. Ifdtype
is not specified, the first 100 rows of the SFrame are used to make a guess of the target data type.Parameters:  fn : function
The function to transform each row of the SFrame. The return type should be convertible to dtype if dtype is not None. This can also be a toolkit extension function which is compiled as a native shared library using SDK.
 dtype : dtype, optional
The dtype of the new SArray. If None, the first 100 elements of the array are used to guess the target data type.
 seed : int, optional
Used as the seed if a random number generator is included in fn.
Returns:  out : SArray
The SArray transformed by fn. Each element of the SArray is of type
dtype
Examples
Concatenate strings from several columns:
>>> sf = turicreate.SFrame({'user_id': [1, 2, 3], 'movie_id': [3, 3, 6], 'rating': [4, 5, 1]}) >>> sf.apply(lambda x: str(x['user_id']) + str(x['movie_id']) + str(x['rating'])) dtype: str Rows: 3 ['134', '235', '361']