fix: adjust clip skip default value from 1 to 2

[mashb1t]

see #3003 (comment)

Background: Fooocus uses clip skip 2 by default, but the variable is called layer_idx and it works similar to ComfyUI, where skipped layers are counted down from -1 (no layer skipped) to infinity (set to last layer when loaded). Values > 12 are possible, they will somewhen reach a maximum of available layers, but are currently limited to 12 to prevent users from creating bad results.

The issues has been resolved by setting clip_skip to 2 by default instead of 1 and renaming the label to indicate the recommended default value.

Code references:

Fooocus/ldm_patched/modules/sdxl_clip.py

Line 9 in e8d88d3

layer_idx=-2

Fooocus/ldm_patched/modules/sd2_clip.py

Line 9 in e8d88d3

layer_idx=-2

Fooocus/ldm_patched/modules/sdxl_clip.py

Line 40 in e8d88d3

self.clip_l = sd1_clip.SDClipModel(layer="hidden", layer_idx=-2, device=device, dtype=dtype, layer_norm_hidden_state=False)

Fooocus/ldm_patched/modules/sd1_clip.py

Lines 106 to 111 in 1cc40d2

	def clip_layer(self, layer_idx):
	if abs(layer_idx) > self.num_layers:
	self.layer = "last"
	else:
	self.layer = "hidden"
	self.layer_idx = layer_idx