try to update failing dockers (#5611)

dockers/base-conda/Dockerfile

@@ -96,15 +96,9 @@ COPY ./requirements/extra.txt requirements-extra.txt
 COPY ./requirements/test.txt requirements-test.txt
 
 RUN \
-    # Disable cache
-    pip config set global.cache-dir false && \
-    # Drop fairscale for PT <= 1.4
-    if [[ $PYTORCH_VERSION < 1.4 ]] ; then \
-        python -c "fname = 'requirements-extra.txt' ; lines = [line for line in open(fname).readlines() if 'fairscale' not in line] ; open(fname, 'w').writelines(lines)" ; \
-    fi && \
     # Install remaining requirements
-    pip install -r requirements-extra.txt --upgrade-strategy only-if-needed && \
-    pip install -r requirements-test.txt --upgrade-strategy only-if-needed && \
+    pip install -r requirements-extra.txt --no-cache-dir && \
+    pip install -r requirements-test.txt --no-cache-dir && \
     rm requirements*
 
 RUN \

dockers/base-cuda/Dockerfile

@@ -90,14 +90,10 @@ RUN \
     #pip install "torch==${PYTORCH_VERSION}.*" --pre && \
     # set particular PyTorch version
     python -c "import re ; fname = 'requirements.txt' ; req = re.sub(r'torch[>=]+[\d\.]+', 'torch==${PYTORCH_VERSION}.*', open(fname).read()) ; open(fname, 'w').write(req)" && \
-    # Drop fairscale for PT <= 1.4
-    if [[ $PYTORCH_VERSION < 1.4 ]] ; then \
-        python -c "fname = 'requirements/extra.txt' ; lines = [line for line in open(fname).readlines() if 'fairscale' not in line] ; open(fname, 'w').writelines(lines)" ; \
-    fi && \
     # Install all requirements
     # todo: find a way how to install nightly PT version
     #  --pre --extra-index-url https://download.pytorch.org/whl/nightly/cu${cuda_ver[0]}${cuda_ver[1]}/torch_nightly.html
-    pip install -r requirements/devel.txt --upgrade-strategy only-if-needed --use-feature=2020-resolver && \
+    pip install -r requirements/devel.txt --no-cache-dir && \
     rm -rf requirements*
 
 RUN \

dockers/base-xla/Dockerfile

@@ -101,7 +101,7 @@ RUN \
     python -c "fname = 'requirements/extra.txt' ; lines = [line for line in open(fname).readlines() if 'fairscale' not in line] ; open(fname, 'w').writelines(lines)" && \
     # drop TorchVision as it was installed with XLA
     python -c "fname = 'requirements/examples.txt' ; lines = [line for line in open(fname).readlines() if not line.startswith('torchvision')] ; open(fname, 'w').writelines(lines)" && \
-    pip install --requirement ./requirements/devel.txt --upgrade-strategy only-if-needed && \
+    pip install --requirement ./requirements/devel.txt --no-cache-dir && \
     cd .. && \
     rm -rf pytorch-lightning && \
     rm -rf /root/.cache

dockers/release/Dockerfile

@@ -29,11 +29,11 @@ RUN \
     #conda install "pip>20.1" && \
     #pip config set global.cache-dir false && \
     if [ -z $LIGHTNING_VERSION ] ; then \
-        pip install ./pytorch-lightning --upgrade-strategy only-if-needed ; \
+        pip install ./pytorch-lightning --no-cache-dir ; \
         rm -rf pytorch-lightning ; \
     else \
         rm -rf pytorch-lightning ; \
-        pip install https://github.com/PyTorchLightning/pytorch-lightning/archive/${LIGHTNING_VERSION}.zip --upgrade-strategy only-if-needed ; \
+        pip install https://github.com/PyTorchLightning/pytorch-lightning/archive/${LIGHTNING_VERSION}.zip --no-cache-dir ; \
     fi
 
 RUN python --version && \

dockers/tpu-tests/Dockerfile

@@ -31,7 +31,7 @@ RUN \
     python -c "fname = 'pytorch-lightning/requirements/extra.txt' ; lines = [line for line in open(fname).readlines() if not line.startswith('horovod')] ; open(fname, 'w').writelines(lines)" && \
     # drop fairscale as it is not needed
     python -c "fname = 'pytorch-lightning/requirements/extra.txt' ; lines = [line for line in open(fname).readlines() if 'fairscale' not in line] ; open(fname, 'w').writelines(lines)" && \
-    pip install -r pytorch-lightning/requirements/devel.txt --no-cache-dir --upgrade-strategy only-if-needed
+    pip install -r pytorch-lightning/requirements/devel.txt --no-cache-dir
 
 #RUN python -c "import pytorch_lightning as pl; print(pl.__version__)"