# -*- encoding: utf-8 -*-
from __future__ import division, print_function, absolute_import, unicode_literals
from h2o.utils.compatibility import * # NOQA
import os
import uuid
import h2o
from h2o.frame import H2OFrame
from h2o.transforms.transform_base import H2OTransformer
from h2o.utils.shared_utils import quoted
from h2o.utils.typechecks import assert_is_type
[docs]class H2OAssembly(object):
"""
H2OAssembly class can be used to specify multiple frame operations in one place.
:returns: a new H2OFrame
Sample usage:
>>> iris = h2o.load_dataset("iris")
>>> from h2o.assembly import *
>>> from h2o.transforms.preprocessing import *
>>> assembly = H2OAssembly(steps=[("col_select",
... H2OColSelect(["Sepal.Length", "Petal.Length", "Species"])),
... ("cos_Sepal.Length",
... H2OColOp(op=H2OFrame.cos, col="Sepal.Length", inplace=True)),
... ("str_cnt_Species",
... H2OColOp(op=H2OFrame.countmatches,
... col="Species",
... inplace=False, pattern="s"))])
>>> result = assembly.fit(iris) # fit the assembly and perform the munging operations
>>> result
Sepal.Length Petal.Length Species Species0
-------------- -------------- ----------- ----------
0.377978 1.4 Iris-setosa 3
0.186512 1.4 Iris-setosa 3
-0.0123887 1.3 Iris-setosa 3
-0.112153 1.5 Iris-setosa 3
0.283662 1.4 Iris-setosa 3
0.634693 1.7 Iris-setosa 3
-0.112153 1.4 Iris-setosa 3
0.283662 1.5 Iris-setosa 3
-0.307333 1.4 Iris-setosa 3
0.186512 1.5 Iris-setosa 3
[150 rows x 4 columns]
In this example, we first load the iris frame. Next, the following data munging operations are performed on the
iris frame
1. only select three columns out of the five columns;
2. take the cosine of the column Sepal.Length and replace the original column with the cosine of the column;
3. want to count the number of rows with the letter s in the class column. Since inplace is set to
False, a new column is generated to hold the result.
Extension class of Pipeline implementing additional methods:
- to_pojo: Exports the assembly to a self-contained Java POJO used in a per-row, high-throughput environment.
In addition, H2OAssembly provides a few static methods that perform element to element operations between
two frames. They all are called as
>>> H2OAssembly.op(frame1, frame2)
while frame1, frame2 are H2OFrame of the same size and same column types. It will return a H2OFrame
containing the element-wise result of operation op. The following operations are currently supported
- divide
- plus
- multiply
- minus
- less_than
- less_than_equal
- equal_equal
- not_equal
- greater_than
- greater_than_equal
"""
# static properties pointing to H2OFrame methods
divide = H2OFrame.__truediv__
"""
Divides one frame from the other.
:returns: the quotient of the frames.
:examples:
>>> python_list1 = [[4,4,4,4],[4,4,4,4]]
>>> python_list2 = [[2,2,2,2], [2,2,2,2]]
>>> frame1 = h2o.H2OFrame(python_obj=python_list1)
>>> frame2 = h2o.H2OFrame(python_obj=python_list2)
>>> H2OAssembly.divide(frame1, frame2)
C1 C2 C3 C4
---- ---- ---- ----
2 2 2 2
2 2 2 2
"""
plus = H2OFrame.__add__
"""
Adds the frames together.
:returns: the sum of the frames.
:examples:
>>> python_list1 = [[4,4,4,4],[4,4,4,4]]
>>> python_list2 = [[2,2,2,2], [2,2,2,2]]
>>> frame1 = h2o.H2OFrame(python_obj=python_list1)
>>> frame2 = h2o.H2OFrame(python_obj=python_list2)
>>> H2OAssembly.plus(frame1, frame2)
C1 C2 C3 C4
---- ---- ---- ----
6 6 6 6
6 6 6 6
"""
multiply = H2OFrame.__mul__
"""
Multiplies the frames together.
:returns: the product of the frames.
:examples:
>>> python_list1 = [[4,4,4,4],[4,4,4,4]]
>>> python_list2 = [[2,2,2,2], [2,2,2,2]]
>>> frame1 = h2o.H2OFrame(python_obj=python_list1)
>>> frame2 = h2o.H2OFrame(python_obj=python_list2)
>>> H2OAssembly.multiply(frame1, frame2)
C1 C2 C3 C4
---- ---- ---- ----
8 8 8 8
8 8 8 8
"""
minus = H2OFrame.__sub__
"""
Subtracts one frame from the other.
:examples: the difference of the frames.
>>> python_list1 = [[4,4,4,4],[4,4,4,4]]
>>> python_list2 = [[2,2,2,2], [2,2,2,2]]
>>> frame1 = h2o.H2OFrame(python_obj=python_list1)
>>> frame2 = h2o.H2OFrame(python_obj=python_list2)
>>> H2OAssembly.minus(frame1, frame2)
C1 C2 C3 C4
---- ---- ---- ----
2 2 2 2
2 2 2 2
"""
less_than = H2OFrame.__lt__
"""
Measures whether one frame is less than the other.
:returns: boolean true/false response (0/1 = no/yes).
:examples:
>>> python_list1 = [[4,4,4,4],[4,4,4,4]]
>>> python_list2 = [[2,2,2,2], [2,2,2,2]]
>>> frame1 = h2o.H2OFrame(python_obj=python_list1)
>>> frame2 = h2o.H2OFrame(python_obj=python_list2)
>>> H2OAssembly.less_than(frame1, frame2)
C1 C2 C3 C4
---- ---- ---- ----
0 0 0 0
0 0 0 0
"""
less_than_equal = H2OFrame.__le__
"""
Measures whether one frame is less than or equal to the other.
:returns: boolean true/false response (0/1 = no/yes).
:examples:
>>> python_list1 = [[4,4,4,4],[4,4,4,4]]
>>> python_list2 = [[2,2,2,2], [2,2,2,2]]
>>> frame1 = h2o.H2OFrame(python_obj=python_list1)
>>> frame2 = h2o.H2OFrame(python_obj=python_list2)
>>> H2OAssembly.less_than_equal(frame1, frame2)
C1 C2 C3 C4
---- ---- ---- ----
0 0 0 0
0 0 0 0
"""
equal_equal = H2OFrame.__eq__
"""
Measures whether the frames are equal.
:returns: boolean true/false response (0/1 = no/yes).
:examples:
>>> python_list1 = [[4,4,4,4],[4,4,4,4]]
>>> python_list2 = [[2,2,2,2], [2,2,2,2]]
>>> frame1 = h2o.H2OFrame(python_obj=python_list1)
>>> frame2 = h2o.H2OFrame(python_obj=python_list2)
>>> H2OAssembly.equal_equal(frame1, frame2)
C1 C2 C3 C4
---- ---- ---- ----
0 0 0 0
0 0 0 0
"""
not_equal = H2OFrame.__ne__
"""
Measures whether the frames are not equal.
:returns: boolean true/false response (0/1 = no/yes).
:examples:
>>> python_list1 = [[4,4,4,4],[4,4,4,4]]
>>> python_list2 = [[2,2,2,2], [2,2,2,2]]
>>> frame1 = h2o.H2OFrame(python_obj=python_list1)
>>> frame2 = h2o.H2OFrame(python_obj=python_list2)
>>> H2OAssembly.not_equal(frame1, frame2)
C1 C2 C3 C4
---- ---- ---- ----
1 1 1 1
1 1 1 1
"""
greater_than = H2OFrame.__gt__
"""
Measures whether one frame is greater than the other.
:returns: boolean true/false response (0/1 = no/yes).
:examples:
>>> python_list1 = [[4,4,4,4],[4,4,4,4]]
>>> python_list2 = [[2,2,2,2], [2,2,2,2]]
>>> frame1 = h2o.H2OFrame(python_obj=python_list1)
>>> frame2 = h2o.H2OFrame(python_obj=python_list2)
>>> H2OAssembly.greater_than(frame1, frame2)
C1 C2 C3 C4
---- ---- ---- ----
1 1 1 1
1 1 1 1
"""
greater_than_equal = H2OFrame.__ge__
"""
Measures whether one frame is greater than or equal to the other.
:returns: boolean true/false response (0/1 = no/yes).
:examples:
>>> python_list1 = [[4,4,4,4],[4,4,4,4]]
>>> python_list2 = [[2,2,2,2], [2,2,2,2]]
>>> frame1 = h2o.H2OFrame(python_obj=python_list1)
>>> frame2 = h2o.H2OFrame(python_obj=python_list2)
>>> H2OAssembly.greater_than_equal(frame1, frame2)
C1 C2 C3 C4
---- ---- ---- ----
1 1 1 1
1 1 1 1
"""
def __init__(self, steps):
"""
Build a new H2OAssembly.
:param steps: A list of steps that sequentially transforms the input data. Each step is a
tuple ``(name, operation)``, where each ``operation`` is an instance of an ``H2OTransformer`` class.
"""
assert_is_type(steps, [(str, H2OTransformer)])
self.id = None
self.steps = steps
self.fuzed = []
self.in_colnames = None
self.out_colnames = None
@property
def names(self):
"""
Gives the column names.
:returns: the specified column names.
:examples:
>>> iris = h2o.load_dataset("iris")
>>> from h2o.assembly import *
>>> from h2o.transforms.preprocessing import *
>>> assembly = H2OAssembly(steps=[("col_select",
... H2OColSelect(["Sepal.Length", "Petal.Length", "Species"])),
... ("cos_Sepal.Length",
... H2OColOp(op=H2OFrame.cos, col="Sepal.Length", inplace=True)),
... ("str_cnt_Species",
... H2OColOp(op=H2OFrame.countmatches,
... col="Species",
... inplace=False, pattern="s"))])
>>> result = assembly.fit(iris)
>>> result.names
[u'Sepal.Length', u'Petal.Length', u'Species', u'Species0']
"""
return list(zip(*self.steps))[0][:-1]
[docs] def to_pojo(self, pojo_name="", path="", get_jar=True):
"""
Convert the munging operations performed on H2OFrame into a POJO.
:param pojo_name: (str) Name of POJO
:param path: (str) path of POJO.
:param get_jar: (bool) Whether to also download the h2o-genmodel.jar file needed to compile the POJO
:return: None
:examples:
>>> from h2o.assembly import *
>>> from h2o.transforms.preprocessing import *
>>> iris = h2o.load_dataset("iris")
>>> assembly = H2OAssembly(steps=[("col_select",
... H2OColSelect(["Sepal.Length",
... "Petal.Length", "Species"])),
... ("cos_Sepal.Length",
... H2OColOp(op=H2OFrame.cos,
... col="Sepal.Length", inplace=True)),
... ("str_cnt_Species",
... H2OColOp(op=H2OFrame.countmatches,
... col="Species", inplace=False,
... pattern="s"))])
>>> result = assembly.fit(iris)
>>> assembly.to_pojo(pojo_name="iris_pojo", path='', get_jar=False)
"""
assert_is_type(pojo_name, str)
assert_is_type(path, str)
assert_is_type(get_jar, bool)
if pojo_name == "":
pojo_name = "AssemblyPOJO_" + str(uuid.uuid4())
java = h2o.api("GET /99/Assembly.java/%s/%s" % (self.id, pojo_name))
file_path = path + "/" + pojo_name + ".java"
if path == "":
print(java)
else:
with open(file_path, 'w', encoding="utf-8") as f:
f.write(java) # this had better be utf-8 ?
if get_jar and path != "":
h2o.api("GET /3/h2o-genmodel.jar", save_to=os.path.join(path, "h2o-genmodel.jar"))
# def union(self, assemblies):
# # fuse the assemblies onto this one, each is added to the end going left -> right
# # assemblies must be a list of namedtuples.
# # [(H2OAssembly, X, y, {params}), ..., (H2OAssembly, X, y, {params})]
# for i in assemblies:
# if not isinstance(i, namedtuple):
# raise ValueError("Not a namedtuple. Assembly must be of type collections.namedtuple with fields [assembly, x, params].")
# if i._fields != ('assembly','x','params'):
# raise ValueError("Assembly must be a namedtuple with fields ('assembly', 'x', 'params').")
# self.fuzed.append(i)
[docs] def fit(self, fr):
"""
To perform the munging operations on a frame specified in steps on the frame fr.
:param fr: H2OFrame where munging operations are to be performed on.
:return: H2OFrame after munging operations are completed.
:examples:
>>> iris = h2o.load_dataset("iris")
>>> assembly = H2OAssembly(steps=[("col_select",
... H2OColSelect(["Sepal.Length",
... "Petal.Length", "Species"])),
... ("cos_Sepal.Length",
... H2OColOp(op=H2OFrame.cos,
... col="Sepal.Length",
... inplace=True)),
... ("str_cnt_Species",
... H2OColOp(op=H2OFrame.countmatches,
... col="Species",
... inplace=False,
... pattern="s"))])
>>> fit = assembly.fit(iris)
>>> fit
"""
assert_is_type(fr, H2OFrame)
steps = "[%s]" % ",".join(quoted(step[1].to_rest(step[0]).replace('"', "'")) for step in self.steps)
j = h2o.api("POST /99/Assembly", data={"steps": steps, "frame": fr.frame_id})
self.id = j["assembly"]["name"]
return H2OFrame.get_frame(j["result"]["name"])