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ASF subversion and git services commented on SINGA478:

Commit 744a979cc95791401dd625664ab34b7988677fb3 in incubatorsinga's branch refs/heads/master
from chrishkchris
[ https://gitbox.apache.org/repos/asf?p=incubatorsinga.git;h=744a979 ]
SINGA478 Add the __itruediv__ for python 3
We need to add _itruediv_ in tensor.py because the original _idiv_ is not supported by python
3 anymore.
To understand the problem, let's study the following code first:
from singa import tensor
from singa import device
import numpy as np
Y = np.ones(shape=[10],dtype=np.float32) * 10.0
y = tensor.from_numpy(Y)
y.to_device(device.get_default_device())
def divide(y):
y /= 10
divide(y)
print(tensor.to_numpy(y))
Without adding the _itruediv_ function, the result is as follows, which means that the /=
operation is not in place:
[10. 10. 10. 10. 10. 10. 10. 10. 10. 10.]
After adding the _itruediv_ function, the result is as follows, which means that the /= operation
is in place:
[1. 1. 1. 1. 1. 1. 1. 1. 1. 1.]
This is because the _idiv_ operation is for python 2, while _itruediv_ is for python 3. Therefore,
if we do not add the _itruediv_ operator in tensor.py, it just uses a default operation which
is not in place.
> Python 3 uses __itruediv__ instead of __idiv__
> 
>
> Key: SINGA478
> URL: https://issues.apache.org/jira/browse/SINGA478
> Project: Singa
> Issue Type: Improvement
> Components: Core
> Reporter: YEUNG SAI HO
> Priority: Major
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> We need to add __itruediv__ in tensor.py because the original __idiv__ is not supported
by python 3 anymore.
>
> To understand the problem, let's study the following code first:
> {code:java}
> from singa import tensor
> from singa import device
> import numpy as np
> Y = np.ones(shape=[10],dtype=np.float32) * 10.0
> y = tensor.from_numpy(Y)
> y.to_device(device.get_default_device())
> def divide(y):
> y /= 10
> divide(y)
> print(tensor.to_numpy(y))
> {code}
> Without adding the {color:#333333}__itruediv__{color} function, the result is as follows,
which means that the /= operation is not in place:
> {code:java}
> [10. 10. 10. 10. 10. 10. 10. 10. 10. 10.]
> {code}
> After adding the __itruediv__ function, the result is as follows, which means that the
/= operation is in place:
> {code:java}
> [1. 1. 1. 1. 1. 1. 1. 1. 1. 1.]
> {code}
> This is because the {color:#333333}__idiv__ operation is for python 2, while __itruediv__
is for python 3. Therefore, if we do not add the __itruediv__ operator in tensor.py, it just
uses a default operation which is not in place.{color}
>
>

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