PDAL | PDAL is Point Data Abstraction Library GDAL for point cloud data | Image Editing library

I found the problem, after receiving a more coherent error message...

I would suggest that you take a close look at the PCD writer documentation for a number of helpful pointers for this particular conversion.

The issue here is that, while double precision floats are valid PCD, they are not supported by PCL's default point types. You could hand edit the PCD file you've already converted, changing the size of the x, y, and z dimensions from 8 to 4. Or you could just rerun pdal translate being sure to set the datatype and precision while selecting the fields you want converted with the order option. An example would look something like

The problem you are facing is because you added the conda activate to the .bashrc script which is only activated for login shells. When you run the container interactively, that is what you are getting. However, when you just try to invoke the python script directly, you do not get a login shell so your conda environment is not activated.

One think you could do is not use the conda activate and instead run the script with conda run. To simplify the command-line, add this entrypoint to your Dockerfile:

ENTRYPOINT ["conda", "run", "-n", "$CONDA_DEFAULT_ENV", "python", "classify.py"]

Using this in the entrypoint also allows the caller to pass command-line arguments via docker run.

From the Dockerfile reference

Command line arguments to docker run will be appended after all elements in an exec form ENTRYPOINT

For a more detailed explanation, see Activating a Conda environment in your Dockerfile