Evaluación diferida en nodos personalizados de ComfyUI
Aplaza la evaluación de entradas en nodos personalizados: marca entradas como lazy en INPUT_TYPES y devuelve solo las necesarias desde check_lazy_status.
Evaluación diferida
De forma predeterminada, todas las entradas required y optional se evalúan antes de que un nodo pueda ejecutarse. Sin embargo, a veces una entrada no necesariamente se usará y evaluarla daría lugar a un procesamiento innecesario. Estos son algunos ejemplos de nodos en los que la evaluación diferida puede resultar beneficiosa:
Un nodo ModelMergeSimple en el que la relación es 0.0 (en cuyo caso el primer modelo no necesita cargarse) o 1.0 (en cuyo caso el segundo modelo no necesita cargarse).
Una interpolación entre dos imágenes en la que la relación (o la máscara) es completamente 0.0 o completamente 1.0.
Un nodo Switch en el que una entrada determina cuál de las otras entradas se transmitirá.
Hacer que una entrada sea diferida tiene muy poco costo. Si puedes hacerlo, por lo general deberías.
Crear entradas diferidas
Hay dos pasos para convertir una entrada en una entrada “diferida”. Son los siguientes:
Marca la entrada como diferida en el diccionario que devuelve INPUT_TYPES
Define un método llamado check_lazy_status (nota: no un método de clase) que se llamará antes de la evaluación para determinar si se necesitan más entradas.
Para demostrarlo, crearemos un nodo “MixImages” que interpola entre dos imágenes según una máscara. Si toda la máscara es 0.0, no necesitamos evaluar ninguna parte del árbol que conduce a la segunda imagen. Si toda la máscara es 1.0, podemos saltar la evaluación de la primera imagen.
Definir INPUT_TYPES
Declarar que una entrada es diferida es tan simple como agregar un par clave-valor lazy: True al diccionario de opciones de la entrada.
En este ejemplo, image1 e image2 están marcadas como entradas diferidas, pero mask siempre se evaluará.
Definir check_lazy_status
Se llama a un método check_lazy_status si hay una o más entradas diferidas que aún no están disponibles. Este método recibe los mismos argumentos que la función de ejecución estándar. Todas las entradas disponibles se pasan con sus valores finales, mientras que las entradas diferidas no disponibles tienen un valor de None.La responsabilidad de la función check_lazy_status es devolver una lista con los nombres de las entradas diferidas que se necesitan para continuar. Si todas las entradas diferidas están disponibles, la función debe devolver una lista vacía.Ten en cuenta que check_lazy_status puede llamarse varias veces. (Por ejemplo, después de evaluar una entrada diferida puedes descubrir que necesitas evaluar otra).
Ten en cuenta que, como la función usa los valores reales de las entradas, no es un método de clase.
def check_lazy_status(self, mask, image1, image2): mask_min = mask.min() mask_max = mask.max() needed = [] if image1 is None and (mask_min != 1.0 or mask_max != 1.0): needed.append("image1") if image2 is None and (mask_min != 0.0 or mask_max != 0.0): needed.append("image2") return needed
Ejemplo completo
class LazyMixImages: @classmethod def INPUT_TYPES(cls): return { "required": { "image1": ("IMAGE",{"lazy": True}), "image2": ("IMAGE",{"lazy": True}), "mask": ("MASK",), }, } RETURN_TYPES = ("IMAGE",) FUNCTION = "mix" CATEGORY = "Examples" def check_lazy_status(self, mask, image1, image2): mask_min = mask.min() mask_max = mask.max() needed = [] if image1 is None and (mask_min != 1.0 or mask_max != 1.0): needed.append("image1") if image2 is None and (mask_min != 0.0 or mask_max != 0.0): needed.append("image2") return needed # Not trying to handle different batch sizes here just to keep the demo simple def mix(self, mask, image1, image2): mask_min = mask.min() mask_max = mask.max() if mask_min == 0.0 and mask_max == 0.0: return (image1,) elif mask_min == 1.0 and mask_max == 1.0: return (image2,) result = image1 * (1. - mask) + image2 * mask, return (result[0],)
Bloqueo de la ejecución
Aunque la Evaluación diferida es la forma recomendada de “desactivar” parte de un gráfico, hay ocasiones en las que quieres desactivar un nodo OUTPUT que no implementa la evaluación diferida por sí mismo. Si es un nodo de salida que desarrollaste tú, simplemente debes agregar la evaluación diferida de la siguiente manera:
Agrega una entrada requerida (si es un nodo nuevo) u opcional (si te importa la compatibilidad hacia atrás) para enabled que tenga True como valor predeterminado
Convierte todas las demás entradas en entradas lazy
Evalúa las demás entradas solo si enabled es True
Si no es un nodo que controlas, puedes usar un comfy_execution.graph.ExecutionBlocker. Este objeto especial se puede devolver como salida desde cualquier socket. Cualquier nodo que reciba un ExecutionBlocker como entrada saltará la ejecución y devolverá ese ExecutionBlocker en todas sus salidas.
Intencionalmente no existe ninguna forma de impedir que un ExecutionBlocker se propague hacia adelante. Si crees que quieres esto, en realidad deberías usar la Evaluación diferida.
Uso
Hay dos formas de construir y usar un ExecutionBlocker
Pasa None al constructor para bloquear la ejecución de forma silenciosa. Esto es útil en casos donde bloquear la ejecución forma parte de una ejecución exitosa, como desactivar una salida.
Pasa una cadena al constructor para mostrar un mensaje de error cuando un nodo se bloquee por recibir el objeto. Esto puede ser útil si quieres mostrar un mensaje de error significativo cuando alguien usa una salida sin sentido, por ejemplo, la salida VAE al cargar un modelo que no contiene VAE.
def load_checkpoint(self, ckpt_name): ckpt_path = folder_paths.get_full_path("checkpoints", ckpt_name) model, clip, vae = load_checkpoint(ckpt_path) if vae is None: # This error is more useful than a "'NoneType' has no attribute" error # in a later node vae = ExecutionBlocker(f"No VAE contained in the loaded model {ckpt_name}") return (model, clip, vae)
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Sin embargo, a veces una entrada no necesariamente se usará y evaluarla daría lugar a un procesamiento innecesario. 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Este método recibe los mismos argumentos que la función de ejecución estándar. Todas las entradas disponibles se pasan con sus valores finales, mientras que las entradas diferidas no disponibles tienen un valor de `,_jsx(_components.code,{children:`None`}),`.`]}),`\n`,_jsxs(_components.p,{children:[`La responsabilidad de la función `,_jsx(_components.code,{children:`check_lazy_status`}),` es devolver una lista con los nombres de las entradas diferidas que se necesitan para continuar. Si todas las entradas diferidas están disponibles, la función debe devolver una lista vacía.`]}),`\n`,_jsxs(_components.p,{children:[`Ten en cuenta que `,_jsx(_components.code,{children:`check_lazy_status`}),` puede llamarse varias veces. (Por ejemplo, después de evaluar una entrada diferida puedes descubrir que necesitas evaluar otra).`]}),`\n`,_jsxs(Tip,{children:[`Ten en cuenta que, como la función usa los valores reales de las entradas, `,_jsx(_components.em,{children:`no`}),` es un método de clase.`]}),`\n`,_jsx(CodeBlock,{filename:``,numberOfLines:`9`,language:`python`,children:_jsx(_components.pre,{className:`shiki shiki-themes github-light-default dark-plus`,style:{backgroundColor:`#ffffff`,\"--shiki-dark-bg\":`#0B0C0E`,color:`#1f2328`,\"--shiki-dark\":`#D4D4D4`},language:`python`,children:_jsxs(_components.code,{language:`python`,numberOfLines:`9`,children:[_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#569CD6`},children:`def`}),_jsx(_components.span,{style:{color:`#8250DF`,\"--shiki-dark\":`#DCDCAA`},children:` 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Cualquier nodo que reciba un `,_jsx(_components.code,{children:`ExecutionBlocker`}),` como entrada saltará la ejecución y devolverá ese `,_jsx(_components.code,{children:`ExecutionBlocker`}),` en todas sus salidas.`]}),`\n`,_jsxs(Tip,{children:[_jsx(_components.strong,{children:`Intencionalmente no existe ninguna forma de impedir que un ExecutionBlocker se propague hacia adelante.`}),` Si crees que quieres esto, en realidad deberías usar la Evaluación diferida.`]}),`\n`,_jsx(Heading,{level:`3`,id:`uso`,children:`Uso`}),`\n`,_jsxs(_components.p,{children:[`Hay dos formas de construir y usar un `,_jsx(_components.code,{children:`ExecutionBlocker`})]}),`\n`,_jsxs(_components.ol,{children:[`\n`,_jsxs(_components.li,{children:[`Pasa `,_jsx(_components.code,{children:`None`}),` al constructor para bloquear la ejecución de forma silenciosa. 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`}),_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#569CD6`},children:`is`}),_jsx(_components.span,{style:{color:`#0550AE`,\"--shiki-dark\":`#569CD6`},children:` None`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:`:`})]}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{style:{color:`#6E7781`,\"--shiki-dark\":`#6A9955`},children:` # This error is more useful than a \"'NoneType' has no attribute\" error`})}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{style:{color:`#6E7781`,\"--shiki-dark\":`#6A9955`},children:` # in a later node`})}),`\n`,_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:` vae `}),_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#D4D4D4`},children:`=`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:` 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