Warnings fix (Lightning-Universe#449)

* Revert "Merge pull request Lightning-Universe#1 from ganprad/warnings_fix"

This reverts commit 7c5aaf0.

* Fixes warning related np.integer in SklearnDataModule

Fixes this warning:
```DeprecationWarning: Converting `np.integer` or `np.signedinteger` to a dtype is deprecated. The current result is `np.dtype(np.int_)` which is not strictly correct. Note that the result depends on the system. To ensure stable results use may want to use `np.int64` or `np.int32````

pl_bolts/datamodules/sklearn_datamodule.py

@@ -52,7 +52,7 @@ def __getitem__(self, idx):
         y = self.Y[idx]
 
         # Do not convert integer to float for classification data
-        if not y.dtype == np.integer:
+        if not ((y.dtype == np.int32) or (y.dtype == np.int64)):
             y = y.astype(np.float32)
 
         if self.X_transform: