Update gym library, and remove unneeded libraries for headless servers

apt.txt

@@ -10,6 +10,5 @@ sudo
 swig
 unzip
 xorg-dev
-xvfb
 zip
 zlib1g-dev

docker/Dockerfile

@@ -12,15 +12,13 @@ RUN apt-get update && apt-get install -y \
         sudo \
         unzip \
         xorg-dev \
-        xvfb \
         zip \
         zlib1g-dev \
     && apt clean \
     && rm -rf /var/lib/apt/lists/*
 
 COPY environment.yml /tmp/
-RUN echo '    - pyvirtualdisplay' >> /tmp/environment.yml \
-    && conda env create -f /tmp/environment.yml \
+RUN conda env create -f /tmp/environment.yml \
     && conda clean -afy \
     && find /opt/conda/ -follow -type f -name '*.a' -delete \
     && find /opt/conda/ -follow -type f -name '*.pyc' -delete \

docker/Dockerfile.gpu

@@ -49,7 +49,6 @@ RUN apt-get update -q && apt-get install -q -y --no-install-recommends \
         swig \
         wget \
         xorg-dev \
-        xvfb \
         zip \
         zlib1g-dev \
         build-essential \
@@ -129,8 +128,7 @@ RUN wget --quiet https://repo.anaconda.com/miniconda/Miniconda3-${CONDA_VERSION}
 # Now we're ready to create our conda environment
 
 COPY environment.yml /tmp/
-RUN echo '    - pyvirtualdisplay' >> /tmp/environment.yml \
-    && conda env create -f /tmp/environment.yml \
+RUN conda env create -f /tmp/environment.yml \
     && conda clean -afy \
     && find /opt/conda/ -follow -type f -name '*.a' -delete \
     && find /opt/conda/ -follow -type f -name '*.pyc' -delete \

environment.yml

@@ -24,7 +24,6 @@ dependencies:
   - pyglet=1.5  # used only in chapter 18 to render environments
   - pyopengl=3.1  # used only in chapter 18 to render environments
   - python=3.10  # your beloved programming language! :)
-  #- pyvirtualdisplay=3.0  # used only in chapter 18 if on headless server
   - requests=2.28  # used only in chapter 19 for REST API queries
   - scikit-learn=1.1  # machine learning library
   - scipy=1.9  # scientific/technical computing library

requirements.txt

@@ -59,10 +59,6 @@ Pillow~=9.2.0
 graphviz~=0.20.1
 pyglet~=1.5.26
 
-#pyvirtualdisplay  # needed in chapter 18, if on a headless server
-                  # (i.e., without screen, e.g., Colab or VM)
-
-
 ##### Google Cloud Platform - used only in chapter 19
 google-cloud-aiplatform~=1.17.0
 google-cloud-storage~=2.5.0