In settings you can change gamepad and keyboard controls.
I will show you how. Because UI is rather cryptic.

Your gamepad should be detected (DirectInput / XInput) BUT (low-level) button layout varies from one gamepad model to the other.
(for example: Buttons ABXY are 1234 but these numbers are always located differently on each gamepad, so if your gamepad is NOT X-box 360 then your character will do heavy attack instead of weak attack and so on. It's will vary between gamepads.)
You don't have to understand it, the point is:

If your gamepad is NOT X-box 360 then it's reccomended to rebind the buttons in settings.

It will make your controlls more comfortable and intuitive.

Connect your gamepad.
Start the game.

Make sure to press 'start' (10th button) or any XYAB (1234th) button on your gamepad - for the main menu to show up. (Don't touch the keyboard: You can press enter on the keyboard instead but the game will ignore your gamepad from here on. The logic here: when you press enter on a keyboard or XYAB/Start on a gamepad - that gamepad/keyboard becomes the device that navigates thru the entire interface.)
Select "Help and options"
Select "Controls"

Now, on this screen you can rebind the buttons:

How:
Push AND HOLD the button you want to remap,
and use up/down to change the function (D-pad or left stick - one of them will work for you).

this is the XYAB layout you should have:
X ('1' in the picture) - weak attack
Y ('2' in the picture) - medium attack
and so on.

(BUT because the game sees your gamepad differently...)
Now, you have to press the whatever button you have in the place of '1' and rebind it to 'light attack'. And so on.

Do it:
Press (and hold) the whatever button you physically have in the place of '1' in picture.
With up/down on D-pad/left stick change it to 'Weak Attack'. (you will see that the different button on the picture is changing it's function-from the one that you actually pressed. This is normal. It just means that the game doesn't sees the layout of your buttons correctly - and you actually need all this to fix it. Keep doing that for the rest of your XYAB buttons, triggers and bumpers).

This is my finished layout (I have cheap Acme gamepad):
Notice how they appear scrambled, but are actually working 1:1 like in the 1st picture posted.
It may be different for you.
I left the triggers and bumpers unchanged.

Once you are done press "start" button to exit. (Start is mapped on button 10 usually, and sadly cannot be changed). - quote from customer support.
If your gamepad doesn't have 10th button (like the gamepads without the triggers) I dunno if you can rebind the buttons on it.

If you enter the "controlls" menu you may have a bug:
you enter the "controlls":
and then you exit back to this screen again.
If you have this bug then you can't change controls for your gamepad.

If you pressed enter on keyboard after game started, then in configuration windows you will see:
This is how configuration window for keyboard looks.

keyboard layout:
GHJB for XYAB.
TYUI for bumpers and triggers.

How to swap actions (you cant change what keyboard buttons are used, but you can swap actions for them):
Press and HOLD the button (GHJB and TYUI buttons),
use [W]/[S] button to change the action.
Press 'enter' when done - it will save the configuration and exit the "controls" menu.

It's rather tricky and not intuitive.

Things to know:
If your gamepad controls the game right now - you can press 'enter' on a keyboard and it will add keyboard as player 2. And vice versa.
If your keyboard controls the game right now - you can press 'enter' (10th button) on a gamepad and it will add gamepad as player 2.
(If your gamepad controls the game right now - it means you pressed Start or XYAB on that gamepad after the game has started.
Or 'enter' on a keyboard in case of a keyboard.)

But it's possible.
When you press button on a gamepad or any of GHJB or TYUI buttons on a keyboard the layout will switch to tab "Player1" or "Player2" for that device and you can change configuration from there.

The layout for a keyboard may be displayed incorrectly.
You may see a keyboard layout like this (like it should):
Or just like a gamepad layout. It may wary.