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体验新版 GitCode,发现更多精彩内容 >>
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615cf42b
编写于
1月 13, 2016
作者:
C
Chiwan Park
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差异文件
[FLINK-2984] [ml] Extend libSVM file format support
This closes #1504.
上级
be055b7a
变更
2
隐藏空白更改
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Showing
2 changed file
with
24 addition
and
20 deletion
+24
-20
flink-libraries/flink-ml/src/main/scala/org/apache/flink/ml/MLUtils.scala
...flink-ml/src/main/scala/org/apache/flink/ml/MLUtils.scala
+22
-18
flink-libraries/flink-ml/src/test/scala/org/apache/flink/ml/MLUtilsSuite.scala
...-ml/src/test/scala/org/apache/flink/ml/MLUtilsSuite.scala
+2
-2
未找到文件。
flink-libraries/flink-ml/src/main/scala/org/apache/flink/ml/MLUtils.scala
浏览文件 @
615cf42b
...
...
@@ -18,12 +18,13 @@
package
org.apache.flink.ml
import
org.apache.flink.api.common.functions.
RichMapFunction
import
org.apache.flink.api.common.functions.
{
RichFlatMapFunction
,
RichMapFunction
}
import
org.apache.flink.api.java.operators.DataSink
import
org.apache.flink.api.scala._
import
org.apache.flink.configuration.Configuration
import
org.apache.flink.ml.common.LabeledVector
import
org.apache.flink.ml.math.SparseVector
import
org.apache.flink.util.Collector
/** Convenience functions for machine learning tasks
*
...
...
@@ -53,17 +54,21 @@ object MLUtils {
* file
*/
def
readLibSVM
(
env
:
ExecutionEnvironment
,
filePath
:
String
)
:
DataSet
[
LabeledVector
]
=
{
val
labelCOODS
=
env
.
readTextFile
(
filePath
).
flatMap
{
line
=>
// remove all comments which start with a '#'
val
commentFreeLine
=
line
.
takeWhile
(
_
!=
'#'
).
trim
if
(
commentFreeLine
.
nonEmpty
)
{
val
splits
=
commentFreeLine
.
split
(
' '
)
val
label
=
splits
.
head
.
toDouble
val
sparseFeatures
=
splits
.
tail
val
coos
=
sparseFeatures
.
map
{
str
=>
val
labelCOODS
=
env
.
readTextFile
(
filePath
).
flatMap
(
new
RichFlatMapFunction
[
String
,
(
Double
,
Array
[(
Int
,
Double
)])]
{
val
splitPattern
=
"\\s+"
.
r
override
def
flatMap
(
line
:
String
,
out
:
Collector
[(
Double
,
Array
[(
Int
,
Double
)])]
)
:
Unit
=
{
val
commentFreeLine
=
line
.
takeWhile
(
_
!=
'#'
).
trim
if
(
commentFreeLine
.
nonEmpty
)
{
val
splits
=
splitPattern
.
split
(
commentFreeLine
)
val
label
=
splits
.
head
.
toDouble
val
sparseFeatures
=
splits
.
tail
val
coos
=
sparseFeatures
.
flatMap
{
str
=>
val
pair
=
str
.
split
(
':'
)
require
(
pair
.
length
==
2
,
"Each feature entry has to have the form <feature>:<value>"
)
...
...
@@ -71,14 +76,13 @@ object MLUtils {
val
index
=
pair
(
0
).
toInt
-
1
val
value
=
pair
(
1
).
toDouble
(
index
,
value
)
}
Some
((
index
,
value
)
)
}
Some
((
label
,
coos
))
}
else
{
None
out
.
collect
((
label
,
coos
))
}
}
}
})
// Calculate maximum dimension of vectors
val
dimensionDS
=
labelCOODS
.
map
{
...
...
flink-libraries/flink-ml/src/test/scala/org/apache/flink/ml/MLUtilsSuite.scala
浏览文件 @
615cf42b
...
...
@@ -40,9 +40,9 @@ class MLUtilsSuite extends FlatSpec with Matchers with FlinkTestBase {
val
content
=
"""
|1 2:10.0 4:4.5 8:4.2 # foo
|1
2:10.0 4:4.5 8:4.2 # foo
|-1 1:9.0 4:-4.5 7:2.4 # bar
|0.4 3:1.0 8:-5.6 10:1.0
|0.4
3:1.0 8:-5.6 10:1.0
|-42.1 2:2.0 4:-6.1 3:5.1 # svm
"""
.
stripMargin
...
...
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