[QUESTION]Create the `pp` groups when enable `context_parallel_size > 1` and `encoder_tensor_parallel_size != tensor_parallel_size`

[heavyrain-lzy]

Your question
I have a quesstion about create the pp groups when enable context_parallel_size > 1 and encoder_tensor_parallel_size != tensor_parallel_size.

When enabling context_parallel, the input will be splited symmetrically in order to balance calculation. Using zip(cycle(e_ranks), d_ranks) is not right.

Megatron-LM/megatron/core/parallel_state.py

Line 602 in 4ff9e66

# Map 1 encoder tp rank to several decoder tp ranks, because