https://jacar.es/funcion-softmax-activacion-para-la-clasificacion/ 2026-07-17T07:27:18+00:00 https://media.jacar.es/wp-content/uploads/2023/03/17092049/softmax.es_.poster.png Función SoftMax: Activación para la clasificación La función softmax, explicada paso a paso. https://media.jacar.es/wp-content/uploads/2023/03/17092045/softmax.es_.mp4 22 https://jacar.es/en/softmax-function-activation-for-classification/ 2026-07-17T07:27:19+00:00 https://media.jacar.es/wp-content/uploads/2023/03/17092101/softmax.en_.poster.png Softmax Function: Activation for Classification The softmax function, explained step by step. https://media.jacar.es/wp-content/uploads/2023/03/17092056/softmax.en_.mp4 22 https://jacar.es/que-es-una-funcion-de-activacion-y-por-que-es-necesaria/ 2026-07-17T07:27:20+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17092116/activation.es_.poster.png Qué es una función de activación y por qué es necesaria Por qué una función de activación no lineal hace posible el aprendizaje profundo. https://media.jacar.es/wp-content/uploads/2026/07/17092112/activation.es_.mp4 22 https://jacar.es/en/what-is-an-activation-function/ 2026-07-17T07:27:21+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17092126/activation.en_.poster.png What Is an Activation Function and Why It Is Needed Why a non-linear activation function makes deep learning possible. https://media.jacar.es/wp-content/uploads/2026/07/17092123/activation.en_.mp4 22 https://jacar.es/entropia-entropia-cruzada-y-divergencia-kl/ 2026-07-17T07:27:24+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17092213/cross-entropy.es_.poster.png Entropía, entropía cruzada y divergencia KL Entropía, entropía cruzada y divergencia KL, visualizadas. https://media.jacar.es/wp-content/uploads/2026/07/17092210/cross-entropy.es_.mp4 22 https://jacar.es/en/entropy-cross-entropy-kl-divergence/ 2026-07-17T07:27:25+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17092226/cross-entropy.en_.poster.png Entropy, Cross-Entropy and KL Divergence Entropy, cross-entropy and KL divergence, visualized. https://media.jacar.es/wp-content/uploads/2026/07/17092221/cross-entropy.en_.mp4 22 https://jacar.es/el-descenso-de-gradiente-gradient-descent/ 2026-07-17T07:27:12+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17091930/gradient-descent.es_.poster.png El descenso de gradiente (gradient descent) El descenso de gradiente, paso a paso: cómo la pendiente guía cada actualización del peso. https://media.jacar.es/wp-content/uploads/2026/07/17091926/gradient-descent.es_.mp4 22 https://jacar.es/en/gradient-descent/ 2026-07-17T07:27:13+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17091943/gradient-descent.en_.poster.png Gradient Descent Gradient descent, step by step: how the slope guides each weight update. https://media.jacar.es/wp-content/uploads/2026/07/17091940/gradient-descent.en_.mp4 22 https://jacar.es/descenso-de-gradiente-lotes-estocastico-mini-batch/ 2026-07-17T07:27:22+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17092148/mini-batch.es_.poster.png Descenso de gradiente por lotes, estocástico y mini-batch Batch, estocástico y mini-batch: tres formas de recorrer los datos. https://media.jacar.es/wp-content/uploads/2026/07/17092140/mini-batch.es_.mp4 22 https://jacar.es/en/batch-stochastic-mini-batch-gradient-descent/ 2026-07-17T07:27:23+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17092202/mini-batch.en_.poster.png Batch, Stochastic and Mini-Batch Gradient Descent Batch, stochastic and mini-batch: three ways to traverse the data. https://media.jacar.es/wp-content/uploads/2026/07/17092157/mini-batch.en_.mp4 22 https://jacar.es/retropropagacion-la-intuicion/ 2026-07-17T07:27:26+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17092240/backprop.es_.poster.png Retropropagación, la intuición detrás del aprendizaje La intuición de la retropropagación: el error fluye hacia atrás por la red. https://media.jacar.es/wp-content/uploads/2026/07/17092237/backprop.es_.mp4 22 https://jacar.es/en/backpropagation-the-intuition/ 2026-07-17T07:27:27+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17092247/backprop.en_.poster.png Backpropagation: The Intuition The intuition of backpropagation: the error flows backward through the network. https://media.jacar.es/wp-content/uploads/2026/07/17092244/backprop.en_.mp4 22 https://jacar.es/retropropagacion-derivacion-matematica-paso-a-paso/ 2026-07-17T07:27:30+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17092316/backprop-derivation.es_.poster.png Retropropagación, la derivación matemática paso a paso La derivación de la retropropagación, factor a factor con la regla de la cadena. https://media.jacar.es/wp-content/uploads/2026/07/17092314/backprop-derivation.es_.mp4 22 https://jacar.es/en/backpropagation-step-by-step-derivation/ 2026-07-17T07:27:31+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17092328/backprop-derivation.en_.poster.png Backpropagation: The Step-by-Step Derivation The backpropagation derivation, factor by factor with the chain rule. https://media.jacar.es/wp-content/uploads/2026/07/17092325/backprop-derivation.en_.mp4 22 https://jacar.es/grafo-computacional-y-diferenciacion-automatica/ 2026-07-17T07:27:28+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17092255/computational-graph.es_.poster.png El grafo computacional y la diferenciación automática El grafo computacional y la diferenciación automática, en acción. https://media.jacar.es/wp-content/uploads/2026/07/17092252/computational-graph.es_.mp4 22 https://jacar.es/en/computational-graph-automatic-differentiation/ 2026-07-17T07:27:29+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17092303/computational-graph.en_.poster.png The Computational Graph and Automatic Differentiation The computational graph and automatic differentiation, in action. https://media.jacar.es/wp-content/uploads/2026/07/17092300/computational-graph.en_.mp4 22 https://jacar.es/momentum-en-el-descenso-de-gradiente/ 2026-07-17T07:27:16+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17092018/momentum.es_.poster.png El momentum en el descenso de gradiente Cómo el momentum acumula velocidad y suaviza el descenso de gradiente. https://media.jacar.es/wp-content/uploads/2026/07/17092016/momentum.es_.mp4 22 https://jacar.es/en/momentum-gradient-descent/ 2026-07-17T07:27:17+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17092035/momentum.en_.poster.png Momentum in Gradient Descent How momentum builds velocity and smooths gradient descent. https://media.jacar.es/wp-content/uploads/2026/07/17092030/momentum.en_.mp4 22 https://jacar.es/el-bucle-agentico-y-el-patron-react/ 2026-07-17T07:27:14+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17091955/agentic-loop.es_.poster.png El bucle agéntico y el patrón ReAct El bucle agéntico —razonar, actuar, observar— en movimiento. https://media.jacar.es/wp-content/uploads/2026/07/17091951/agentic-loop.es_.mp4 23 https://jacar.es/en/agentic-loop-and-react-pattern/ 2026-07-17T07:27:15+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17092006/agentic-loop.en_.poster.png The Agentic Loop and the ReAct Pattern The agentic loop —reason, act, observe— in motion. https://media.jacar.es/wp-content/uploads/2026/07/17092001/agentic-loop.en_.mp4 23 https://jacar.es/lab/hands-on/instalar-portainer-docker-compose/ 2026-07-13T18:25:38+00:00 https://media.jacar.es/wp-content/uploads/2026/07/13202509/instalar-portainer-docker-compose.es_.poster.png Instalar Portainer con Docker Compose v2 Instala Portainer en Docker paso a paso: volumen persistente, contenedor con la UI en el puerto 9443 y acceso web verificado. Cada paso se comprueba. https://media.jacar.es/wp-content/uploads/2026/07/13202459/instalar-portainer-docker-compose.es_.mp4 52 https://jacar.es/en/lab/hands-on/install-portainer-docker-compose/ 2026-07-13T18:25:39+00:00 https://media.jacar.es/wp-content/uploads/2026/07/13202515/instalar-portainer-docker-compose.en_.poster.png Install Portainer with Docker Compose v2 Install Portainer on Docker step by step: a persistent volume, the container serving the UI on port 9443, and verified web access. Every step is checked. https://media.jacar.es/wp-content/uploads/2026/07/13202510/instalar-portainer-docker-compose.en_.mp4 52 https://jacar.es/lab/hands-on/redes-docker-bridge-y-personalizadas/ 2026-07-17T12:59:02+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17145309/redes-docker-bridge-y-personalizadas.es_.poster.png Cómo funcionan las redes en Docker (bridge y personalizadas) Docker conecta los contenedores a una red bridge por defecto, pero esa red no resuelve nombres: solo funciona por IP. Al crear una red personalizada con docker network create, Docker activa un DNS interno y cada contenedor puede localizar a los demás por su nombre, quedando aislado del resto de redes. https://media.jacar.es/wp-content/uploads/2026/07/17145304/redes-docker-bridge-y-personalizadas.es_.mp4 137 https://jacar.es/en/lab/hands-on/docker-networking-bridge-and-custom/ 2026-07-17T12:59:03+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17145327/redes-docker-bridge-y-personalizadas.en_.poster.png Docker Networking (Bridge and Custom) Docker attaches every container to a default bridge network, but that network only works by IP: it resolves no names. Create a user-defined network with docker network create and Docker turns on an internal DNS server, so containers reach each other by name and stay isolated from every other network. https://media.jacar.es/wp-content/uploads/2026/07/17145323/redes-docker-bridge-y-personalizadas.en_.mp4 137 https://jacar.es/lab/hands-on/volumenes-docker-persistencia-de-datos/ 2026-07-17T12:59:04+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17145345/volumenes-docker-persistencia-de-datos.es_.poster.png Cómo persisten los datos en Docker con volúmenes y bind mounts Un contenedor es efímero, pero sus datos no tienen por qué serlo. Un volumen de Docker vive fuera del contenedor, gestionado por Docker, mientras que un bind mount usa directamente una ruta del host. En este laboratorio creamos un volumen con nombre, escribimos datos desde un contenedor, lo eliminamos por completo y leemos esos mismos datos desde uno nuevo. https://media.jacar.es/wp-content/uploads/2026/07/17145341/volumenes-docker-persistencia-de-datos.es_.mp4 129 https://jacar.es/en/lab/hands-on/how-data-persists-in-docker-with-volumes-and-bind-mounts/ 2026-07-17T12:59:05+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17145359/volumenes-docker-persistencia-de-datos.en_.poster.png How Data Persists in Docker with Volumes and Bind Mounts A container is ephemeral, but its data doesn't have to be. A Docker volume lives outside the container, managed by Docker itself, while a bind mount uses a host path directly. In this lab we create a named volume, write data from one container, remove that container entirely, and read the same data back from a brand-new one. https://media.jacar.es/wp-content/uploads/2026/07/17145355/volumenes-docker-persistencia-de-datos.en_.mp4 129 https://jacar.es/lab/hands-on/docker-compose-multi-contenedor/ 2026-07-17T12:59:06+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17145412/docker-compose-multi-contenedor.es_.poster.png Cómo montar una app multi-contenedor con Docker Compose Docker Compose es la herramienta que describe una aplicación multi-contenedor en un único archivo YAML: qué servicios levantar, cómo se conectan en red y qué datos persisten en volúmenes con nombre. En este lab defines un servicio web con Nginx y una caché con Redis, los conectas por nombre de servicio y compruebas todo con curl. https://media.jacar.es/wp-content/uploads/2026/07/17145408/docker-compose-multi-contenedor.es_.mp4 119 https://jacar.es/en/lab/hands-on/how-to-build-a-multi-container-app-with-docker-compose/ 2026-07-17T12:59:07+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17145419/docker-compose-multi-contenedor.en_.poster.png How to Build a Multi-Container App with Docker Compose Docker Compose describes a multi-container application in a single YAML file: which services to run, how they talk to each other over the network, and which data persists in named volumes. In this lab you define an Nginx web service and a Redis cache, connect them by service name, and confirm it all works with curl. https://media.jacar.es/wp-content/uploads/2026/07/17145415/docker-compose-multi-contenedor.en_.mp4 119 https://jacar.es/lab/hands-on/copias-de-seguridad-de-volumenes-docker/ 2026-07-17T12:59:08+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17145432/copias-de-seguridad-de-volumenes-docker.es_.poster.png Copia de seguridad y restauración de volúmenes en Docker Un volumen Docker guarda datos fuera del contenedor, en una ubicación que gestiona el propio Docker. Para respaldarlo, un contenedor alpine desechable monta el volumen y una carpeta del host, y empaqueta los datos con tar en un .tar.gz. Restaurar es el proceso inverso: extraer ese archivo dentro de un volumen nuevo y comprobar que los datos vuelven intactos. https://media.jacar.es/wp-content/uploads/2026/07/17145429/copias-de-seguridad-de-volumenes-docker.es_.mp4 130 https://jacar.es/en/lab/hands-on/docker-volume-backup-and-restore/ 2026-07-17T12:59:09+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17145444/copias-de-seguridad-de-volumenes-docker.en_.poster.png Docker Volume Backup and Restore A Docker volume stores data outside the container, in a location Docker itself manages. To back it up, a throwaway alpine container mounts the volume and a host folder, then packs the data into a .tar.gz with tar. Restoring reverses the process: extract that file into a fresh volume and confirm the data comes back intact. https://media.jacar.es/wp-content/uploads/2026/07/17145440/copias-de-seguridad-de-volumenes-docker.en_.mp4 130 https://jacar.es/lab/hands-on/pihole-en-docker-dns-sinkhole/ 2026-07-17T12:59:10+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17145455/pihole-en-docker-dns-sinkhole.es_.poster.png Pi-hole en Docker: sinkhole DNS para bloquear anuncios en toda la red Pi-hole es un resolvedor DNS que actúa como sinkhole: filtra las consultas de toda tu red antes de que lleguen a Internet y bloquea los dominios de publicidad y rastreo de sus listas, respondiendo 0.0.0.0 en vez de reenviarlas. En este lab lo levantas en Docker y lo compruebas en vivo con dig. https://media.jacar.es/wp-content/uploads/2026/07/17145452/pihole-en-docker-dns-sinkhole.es_.mp4 105 https://jacar.es/en/lab/hands-on/pihole-in-docker-dns-sinkhole/ 2026-07-17T12:59:11+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17145509/pihole-en-docker-dns-sinkhole.en_.poster.png Pihole in Docker (DNS Sinkhole) Pi-hole is a DNS resolver that acts as a sinkhole: it filters every query on your network before it reaches the internet and blocks ad and tracking domains from its lists, answering 0.0.0.0 instead of forwarding them. In this lab you run it in Docker and prove it live with dig. https://media.jacar.es/wp-content/uploads/2026/07/17145505/pihole-en-docker-dns-sinkhole.en_.mp4 105 https://jacar.es/lab/hands-on/traefik-proxy-inverso-con-docker/ 2026-07-17T12:59:12+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17145527/traefik-proxy-inverso-con-docker.es_.poster.png Proxy inverso con Traefik y Docker (enrutado real por Host) Traefik con Docker es un proxy inverso que lee el socket de Docker y convierte las etiquetas de cada contenedor en reglas de enrutado automáticas. En este laboratorio lo levantas junto a dos backends y compruebas con curl que cada nombre de host llega al contenedor correcto, sin tocar ningún fichero de rutas. https://media.jacar.es/wp-content/uploads/2026/07/17145521/traefik-proxy-inverso-con-docker.es_.mp4 115 https://jacar.es/en/lab/hands-on/traefik-reverse-proxy-with-docker/ 2026-07-17T12:59:13+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17145544/traefik-proxy-inverso-con-docker.en_.poster.png Traefik Reverse Proxy with Docker Traefik with Docker is a reverse proxy that reads the Docker socket and turns each container's labels into automatic routing rules. In this lab you bring it up alongside two backends and use curl to prove each hostname reaches the right container, without editing a single routes file. https://media.jacar.es/wp-content/uploads/2026/07/17145538/traefik-proxy-inverso-con-docker.en_.mp4 115 https://jacar.es/lab/hands-on/gestion-de-secretos-en-docker/ 2026-07-17T12:59:14+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17145603/gestion-de-secretos-en-docker.es_.poster.png Gestión de secretos en Docker (sin dejarlos en la imagen) La gestión de secretos en Docker significa nunca dejar tokens ni contraseñas en ARG, ENV o COPY del Dockerfile, porque quedan grabados en la imagen para siempre. Este lab demuestra la fuga real con docker history y la corrige con BuildKit --secret, un archivo de solo lectura, un env-file acotado y los secrets nativos de Compose. https://media.jacar.es/wp-content/uploads/2026/07/17145600/gestion-de-secretos-en-docker.es_.mp4 145 https://jacar.es/en/lab/hands-on/managing-secrets-in-docker-without-baking-them-into-the-image/ 2026-07-17T12:59:15+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17145620/gestion-de-secretos-en-docker.en_.poster.png Managing Secrets in Docker (without baking them into the image) Docker secrets management means never leaving tokens or passwords in a Dockerfile's ARG, ENV, or COPY, because they get baked into the image forever. This lab demonstrates the real leak with docker history and fixes it with a BuildKit --secret, a read-only file mount, a scoped env-file, and Compose's native secrets. https://media.jacar.es/wp-content/uploads/2026/07/17145616/gestion-de-secretos-en-docker.en_.mp4 145 https://jacar.es/lab/hands-on/healthchecks-y-politicas-de-reinicio-docker/ 2026-07-17T12:59:16+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17145636/healthchecks-y-politicas-de-reinicio-docker.es_.poster.png Healthchecks y políticas de reinicio en Docker (en la práctica, con docker run y Compose) Un HEALTHCHECK le dice a Docker cómo comprobar si un contenedor funciona de verdad, no solo si sigue en marcha; docker inspect y docker ps muestran ese estado como healthy o unhealthy. Las políticas de reinicio deciden qué pasa si el proceso falla: no, on-failure, always o unless-stopped, y Compose puede esperar a un servicio healthy antes de arrancar otro. https://media.jacar.es/wp-content/uploads/2026/07/17145632/healthchecks-y-politicas-de-reinicio-docker.es_.mp4 139 https://jacar.es/en/lab/hands-on/docker-healthchecks-and-restart-policies/ 2026-07-17T12:59:17+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17145655/healthchecks-y-politicas-de-reinicio-docker.en_.poster.png Docker Healthchecks and Restart Policies A HEALTHCHECK tells Docker how to check whether a container is truly working, not just still running; docker inspect and docker ps surface that state as healthy or unhealthy. Restart policies decide what happens when the process fails: no, on-failure, always, or unless-stopped, and Compose can wait for a service to turn healthy before starting the next one. https://media.jacar.es/wp-content/uploads/2026/07/17145652/healthchecks-y-politicas-de-reinicio-docker.en_.mp4 139 https://jacar.es/lab/hands-on/imagenes-docker-multi-stage/ 2026-07-17T12:59:18+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17145717/imagenes-docker-multi-stage.es_.poster.png Multi-stage builds en Docker: imágenes más pequeñas y seguras Un multi-stage build en Docker encadena varias etapas FROM en un mismo Dockerfile: una compila con el compilador completo y la etapa final, mínima (Alpine, scratch o distroless), solo copia el binario resultante con COPY --from=build. La imagen de producción queda mucho más pequeña y con menor superficie de ataque. https://media.jacar.es/wp-content/uploads/2026/07/17145713/imagenes-docker-multi-stage.es_.mp4 141 https://jacar.es/en/lab/hands-on/multi-stage-docker-builds-smaller-more-secure-images/ 2026-07-17T12:59:19+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17145727/imagenes-docker-multi-stage.en_.poster.png Multi-Stage Docker Builds: Smaller, More Secure Images A multi-stage Docker build chains several FROM stages inside one Dockerfile: one compiles with the full toolchain, and the final, minimal stage (Alpine, scratch or distroless) copies only the resulting binary with COPY --from=build. The production image ends up far smaller, with a much smaller attack surface. https://media.jacar.es/wp-content/uploads/2026/07/17145724/imagenes-docker-multi-stage.en_.mp4 141 https://jacar.es/lab/hands-on/registro-docker-privado-autoalojado/ 2026-07-17T12:59:20+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17145748/registro-docker-privado-autoalojado.es_.poster.png Cómo montar un registro Docker privado y autoalojado Un registro Docker privado es el servidor que guarda y sirve tus propias imágenes de contenedor en vez de Docker Hub. En este laboratorio levantas la imagen oficial registry:3, etiquetas y subes una imagen alpine, la recuperas tras borrarla en local y la proteges con htpasswd y TLS. https://media.jacar.es/wp-content/uploads/2026/07/17145743/registro-docker-privado-autoalojado.es_.mp4 125 https://jacar.es/en/lab/hands-on/how-to-run-a-private-self-hosted-docker-registry/ 2026-07-17T12:59:21+00:00 https://media.jacar.es/wp-content/uploads/2026/07/17145759/registro-docker-privado-autoalojado.en_.poster.png How to Run a Private, Self-Hosted Docker Registry A private Docker registry is the server that stores and serves your own container images instead of Docker Hub. In this lab you bring up the official registry:3 image, tag and push an alpine image, pull it back after deleting it locally, and secure it with htpasswd and TLS. https://media.jacar.es/wp-content/uploads/2026/07/17145755/registro-docker-privado-autoalojado.en_.mp4 125