At a minimum, your code will run on a 16-core machine with 120 GB of memory. Code that utilizes a GPU will run on a 4-core machine with 60 GB of memory and an NVIDIA K80 GPU.
For the technically inclined, the CPU default machine is an AWS r5d.4xlarge and the GPU machine is an AWS g4dn.2xlarge.
Note: the availability of CPU and RAM can vary depending on load, as other computations may share the same underlying machine.