Files
Leonid Ganeline 1c81883d42 added docstrings where they missed (#6626)
This PR targets the `API Reference` documentation.
- Several classes and functions missed `docstrings`. These docstrings
were created.
- In several places this

```
except ImportError:
        raise ValueError(
```

        was replaced to 

```
except ImportError:
        raise ImportError(
```
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..
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