Replacing Deprecated Imports from scipy.misc

[micat001]

PR Motivation

• scipy.misc.imresize has been deprecated
• scipy.misc.imread has also been deprecated
• Warnings on using np.stack() without brackets.
• Minor textual updates to README, requirements.txt and argparser defaults.
• Addresses issues raised by Large Errors on Pose Prediction Network #134

Changes

This PR replaces all import of scipy.misc.imresize with from skimage.transform import resize as imresize and all imports of scipy.misc.imread with from imageio import imread.

It fixes a minor typo in the README groud -> ground as well as updates the requirements.txt to add the new import dependency (scikit-image). I've also updated the argparser in data/prepare_train_data.py to a default dataset_format of kitti_raw as the prior default was not an acceptable choice (kitti when the allowed choices were choices=["kitti_raw", "kitti_odometry", "cityscapes"]).

Results

The results were validated with Python 3.8 and 3.9 and seemed to be approximately equivalent to the repo reported results.

Pose Results

Sequence	ATE	RE
09 (Pull Request)	0.0195 (std 0.0107)	0.0041 (std 0.0022)
09 (Repo Results)	0.0179 (std. 0.0110)	0.0018 (std. 0.0009)
10 (Pull Request)	0.0148 (std 0.0096)	0.0042 (std 0.0027)
10 (Repo Results)	0.0141 (std 0.0115)	0.0018 (std 0.0011)

Depth Results

	Abs Rel	Sq Rel	RMSE	RMSE (log)	Acc. 1	Acc. 2	Acc. 3
Pull Request	0.181	1.340	6.222	0.261	0.733	0.908	0.964
Repo Results	0.181	1.341	6.236	0.262	0.733	0.901	0.964

[ClementPinard]

LGTM
thank you !