Add python built-in types support for `tf.as_dtype` (#17652)
* Add python built-in types support for `tf.as_dtype`
This fix tries to address the issue raised in 17641 where
it was not possible to use `tf.as_dtype(float)` the same
way as numpy `np.dtype(float)`.
This fix adds the built-in types support for `tf.as_dtype`,
so that it is possible to specify:
```
dtypes.as_dtype(float) # dtypes.float64
dtypes.as_dtype(int) # dtypes.int32
dtypes.as_dtype(long) # dtypes.int64
dtypes.as_dtype(complex) # dtypes.complex128
dtypes.as_dtype(bool) # dtypes.bool
```
This fix fixes 17641.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
* Add test cases for built-in types support with `tf.as_dtype`
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
* Fix failed test cases with added built-in types support of tf.as_dtype
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
* Fix python 3 build
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
* Restrict the changes to float and bool based on review feedback
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>