# Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved. """Megatron distributed optimizer.""" import math import torch from megatron import print_rank_0 from megatron.core import mpu, tensor_parallel from .optimizer import MixedPrecisionOptimizer, _zero_grad_group_helper class Range: """ A range represents a start and end points for indexing a shard from a full tensor. """ def __init__(self, start, end): self.start = start self.end = end self.size = end - start def normalize(self, start = 0): return Range(start, start + self.size) def __str__(self): return "%d,%d [%d]" % (self.start, self.end, self.size) class DistributedOptimizer(MixedPrecisionOptimizer): """Distributed optimizer, for all data types (fp16, bf16, and fp32). Arguments: optimizer: base optimizer such as Adam or SGD clip_grad: clip gradeints with this global L2 norm. Note that clipping is ignored if clip_grad == 0 log_num_zeros_in_grad: return number of zeros in the gradients. params_have_main_grad: flag indicating if parameters have a `main_grad` field. If this is set, we are assuming that the model parameters are store in the `main_grad` field instead of the typical `grad` field. This happens for the DDP cases where there is a continuous buffer holding the gradients. For example for bfloat16, we want to do gradient accumulation and all-reduces in float32 and as a result we store those gradients in the main_grad. Note that main grad is not necessarily in float32. use_contiguous_buffers_in_local_ddp: if true, the local DDP model is using a contiguous buffer to hold the model grads. fp16: if true, the model is running in fp16. bf16: if true, the model is running in bfloat16. grad_scaler: used for scaling gradients. Note that this can be None. This case happens when `bf16 = True` and we don't use any loss scale. Note that for `bf16 = True`, we can have a constnat gradient scaler. Also for `bf16 = False`, we always require a grad scaler. models: list of models (i.e., the virtual pipelining models). This is used by the distributed optimizer for mapping parameters. """ @classmethod def build_model_gbuf_param_range_map(cls, model, dtype, gbuf_world_range): """ Build mapping from param reference to grad buffer shard ranges. This method builds a mapping from parameter references to grad buffer shard ranges, specific to each data-parallel (DP) rank's set of 'owned' parameters. Each grad buffer (padded to be an even multiple of DP-world-size) is conceptually divided into DP-world-size contiguous regions, where each DP rank 'owns' a contiguous regions. Ownership in this sense means DP rank is responsible for reducing the relevant subset of grads, and updating the relevant subset of params. This conceptual partitioning of the grad buffer does NOT respect parameter boundaries, and as such it is assumed that each created range references a shard (or subset) of the full parameter. It is easiest to think of each DP rank as operating (i.e., reducing, gathering) purely on views into the grad buffer, for all model-to- main & main-to-model operations. This method creates three ranges: - The param's range within the entire grad buffer (i.e., world index). - The param's range within the DP rank's local view of the grad buffer. - The param's range within itself (i.e., its shard). """ # Param range map. param_world_index_map = model._grad_buffer_param_index_map[dtype] param_range_map = {} for param, param_world_indexes in param_world_index_map.items(): # Param range. param_world_start, param_world_end = param_world_indexes param_local_start = max( 0, param_world_start - gbuf_world_range.start) param_local_end = min( gbuf_world_range.size, param_world_end - gbuf_world_range.start) # Add param, if within local gbuf range. if param_local_end > param_local_start: param_local_range = Range(param_local_start, param_local_end) param_world_range = param_local_range.normalize( param_local_start + gbuf_world_range.start) sub_param_start = max(0, gbuf_world_range.start-param_world_start) sub_param_range = param_local_range.normalize(sub_param_start) param_range_map[param] = { "gbuf_world": param_world_range, "gbuf_local": param_local_range, "param" : sub_param_range, } return param_range_map @classmethod def build_model_gbuf_range(cls, model, dtype): """ Build mapping between params and their grad buffers. This method does the initial setup for the method above. This setup includes determining the shard ranges into the DDP's grad buffer for each data-parallel (DP) rank. Each DP rank keeps range info for all other DP ranks, for the purpose of creating args for reduce-scatter and all-gather. """ data_parallel_rank = mpu.get_data_parallel_rank() data_parallel_world_size = mpu.get_data_parallel_world_size() # Grad buffer range. grad_buffer = model._grad_buffers[dtype] gbuf_size = grad_buffer.numel max_gbuf_range_size = int(math.ceil(gbuf_size / data_parallel_world_size)) # All world ranges. (i.e., across all data parallel ranks) gbuf_world_all_ranges = [] for r in range(data_parallel_world_size): gbuf_world_start = r * max_gbuf_range_size gbuf_world_end = min(gbuf_size, gbuf_world_start+max_gbuf_range_size) gbuf_world_range = Range(gbuf_world_start, gbuf_world_end) gbuf_world_all_ranges.append(gbuf_world_range) # Local DP's ranges. gbuf_world_range = gbuf_world_all_ranges[data_parallel_rank] gbuf_local_range = gbuf_world_range.normalize() # Get each param's ranges. param_range_map = cls.build_model_gbuf_param_range_map(model, dtype, gbuf_world_range) # Group into dict. data = { "local" : gbuf_local_range, "world" : gbuf_world_range, "world_all" : gbuf_world_all_ranges, "param_map" : param_range_map, "max_range_size" : max_gbuf_range_size, } return data @classmethod def build_model_gbuf_range_map(cls, model): """ Create param-to-grad-buffer mappings, for grad buffer data types within a specific virtual model. """ return { dtype : cls.build_model_gbuf_range(model, dtype) for dtype in model._grad_buffers } @classmethod def build_model_param_gbuf_map(cls, model_gbuf_ranges): """ Create a reverse of the model_gbuf_ranges, for referencing in opposite direction. """ param_gbuf_map = {} for model_index, model_gbuf_range_map in enumerate(model_gbuf_ranges): for dtype, gbuf_range_map in model_gbuf_range_map.items(): for param, param_range_map in gbuf_range_map["param_map"].items(): param_gbuf_map[param] = (model_index, dtype) return param_gbuf_map @classmethod def build_optimizer_group_ranges(cls, param_groups, model_gbuf_ranges): """ Create optimizer groups. Given the set of parameter shard ranges that are owned by the current data-parallel (DP) rank, gather the set of parameters that will be used (in the method below) to create the current DP's optimizer groups. """ num_groups = len(param_groups) # Param group map. param_group_map = {} for group_index, group in enumerate(param_groups): for param in group["params"]: assert param.requires_grad param_group_map[param] = group_index # Optimizer group ranges. group_ranges = [ {"params": []} for _ in param_groups ] for model_gbuf_range_map in model_gbuf_ranges: for dtype, gbuf_range_map in model_gbuf_range_map.items(): for param in gbuf_range_map["param_map"]: group_index = param_group_map[param] group_range = group_ranges[group_index] group_range["params"].append(param) # Squeeze zero-size group ranges. for group_index, group_range in enumerate(group_ranges): group_range["orig_group"] = param_groups[group_index] group_ranges = [ g for g in group_ranges if len(g["params"]) > 0 ] return group_ranges @classmethod def build_model_and_main_param_groups(cls, model_gbuf_ranges, param_gbuf_map, opt_group_ranges): """ Create main parameter groups needed for the optimizer step. These groups encompass both: 1) groups used by this class, for reducing/gather, and 2) groups used by the inner optimizer for the parameter update. Given that the conceptual grad buffer partitioning (created in earlier method) doesn't respect parameter boundaries, the optimizer operates on shards of the model parameters, rather than the full parameters. """ # Parameter groups: # model_float16_groups: original float16 parameters # model_fp32_groups: original fp32 parameters # shard_float16_groups: shards of original float16 parameters # shard_fp32_groups: shards of original fp32 parameters # shard_fp32_from_float16_groups: fp32 copy of float16 parameters model_float16_groups = [] model_fp32_groups = [] shard_float16_groups = [] shard_fp32_groups = [] shard_fp32_from_float16_groups = [] # Allocate (or slice) each group's param shard. for group_index, group_range in enumerate(opt_group_ranges): # Params of this group. model_float16_params_this_group = [] model_fp32_params_this_group = [] shard_float16_params_this_group = [] shard_fp32_params_this_group = [] shard_fp32_from_float16_params_this_group = [] model_float16_groups.append(model_float16_params_this_group) model_fp32_groups.append(model_fp32_params_this_group) shard_float16_groups.append(shard_float16_params_this_group) shard_fp32_groups.append(shard_fp32_params_this_group) shard_fp32_from_float16_groups.append( shard_fp32_from_float16_params_this_group) for model_param in group_range["params"]: assert model_param.requires_grad model_index, dtype = param_gbuf_map[model_param] gbuf_range = model_gbuf_ranges[model_index][dtype] param_range = gbuf_range["param_map"][model_param]["param"] # fp16, bf16 params. if model_param.type() in ['torch.cuda.HalfTensor', 'torch.cuda.BFloat16Tensor']: # Clone model -> main. shard_model_param = model_param.detach().view(-1) \ [param_range.start:param_range.end] shard_main_param = shard_model_param.clone().float() tensor_parallel.copy_tensor_model_parallel_attributes( shard_model_param, model_param) tensor_parallel.copy_tensor_model_parallel_attributes( shard_main_param, model_param) if hasattr(model_param, 'shared'): shard_model_param.shared = model_param.shared shard_main_param.shared = model_param.shared # Add to group. model_float16_params_this_group.append(model_param) shard_float16_params_this_group.append(shard_model_param) shard_fp32_from_float16_params_this_group.append(shard_main_param) # fp32 params. elif model_param.type() == 'torch.cuda.FloatTensor': shard_model_param = model_param.view(-1) \ [param_range.start:param_range.end] model_fp32_params_this_group.append(model_param) shard_fp32_params_this_group.append(shard_model_param) tensor_parallel.copy_tensor_model_parallel_attributes( shard_model_param, model_param) if hasattr(model_param, 'shared'): shard_model_param.shared = model_param.shared else: raise TypeError('Wrapped parameters must be one of ' 'torch.cuda.FloatTensor, ' 'torch.cuda.HalfTensor, or ' 'torch.cuda.BFloat16Tensor. ' 'Received {}'.format(param.type())) # Update optimizer's params. group_range["orig_group"]["params"] = [ *shard_fp32_params_this_group, *shard_fp32_from_float16_params_this_group, ] return ( model_float16_groups, model_fp32_groups, shard_float16_groups, shard_fp32_groups, shard_fp32_from_float16_groups, ) def __init__(self, optimizer, clip_grad, log_num_zeros_in_grad, params_have_main_grad, use_contiguous_buffers_in_local_ddp, fp16, bf16, params_dtype, grad_scaler, models): """ See top of class definition for argument descriptions. The steps in this method create the core mapping between DDP grad buffers, parameters, and parameter shard ranges, that is needed for converting between model param indexes and main parameter shard indexes. This method also updates the optimizer parameter groups with the newly created shards. """ super().__init__( optimizer, clip_grad, log_num_zeros_in_grad, params_have_main_grad, use_contiguous_buffers_in_local_ddp, fp16, bf16, params_dtype, grad_scaler, models) # Verify that contiguous buffers are being used. # - Note: this should already be checked in arguments.py. assert use_contiguous_buffers_in_local_ddp # Model grad buffer ranges. self.model_gbuf_ranges = [] for model_index, model in enumerate(self.models): self.model_gbuf_ranges.append(self.build_model_gbuf_range_map(model)) self.model_param_gbuf_map = \ self.build_model_param_gbuf_map(self.model_gbuf_ranges) # Optimizer ranges. self.opt_group_ranges = self.build_optimizer_group_ranges( self.optimizer.param_groups, self.model_gbuf_ranges) # Allocate main param shards. ( self.model_float16_groups, self.model_fp32_groups, self.shard_float16_groups, self.shard_fp32_groups, self.shard_fp32_from_float16_groups, ) = self.build_model_and_main_param_groups(self.model_gbuf_ranges, self.model_param_gbuf_map, self.opt_group_ranges) # Initialize param buffers. # - These are views on the DDP model's grad buffers, that share # storage & have their own dtype. This is safe because the param # dtype size is always <= grad dtype size. self.param_buffers = [] for model_index, model in enumerate(self.models): current_param_buffers = {} for dtype, grad_buffer in model._grad_buffers.items(): param_buffer = torch.tensor(grad_buffer.data.storage()._untyped(), dtype = params_dtype, device = grad_buffer.data.device) param_buffer = param_buffer[:grad_buffer.numel_padded] current_param_buffers[dtype] = param_buffer self.param_buffers.append(current_param_buffers) # Update optimizer groups. # - Also, leverage state_dict() and load_state_dict() to # recast preexisting per-param state tensors. self.optimizer.param_groups = \ [ g["orig_group"] for g in self.opt_group_ranges ] self.optimizer.load_state_dict(self.optimizer.state_dict()) def get_model_param_range_map(self, param): """ Given a model param, get the index sub-range of the param that this data-parallel rank owns. """ model_index, dtype = self.model_param_gbuf_map[param] gbuf_range_map = self.model_gbuf_ranges[model_index][dtype] param_range_map = gbuf_range_map["param_map"][param] return param_range_map def get_model_parallel_group(self): """ With the distributed optimizer, the model parallel group is the entire world. """ return None def state_dict(self): """ The state dict must contain the fp32-from-float16 shards. """ state_dict = {} state_dict['optimizer'] = self.optimizer.state_dict() if self.grad_scaler: state_dict['grad_scaler'] = self.grad_scaler.state_dict() state_dict['shard_fp32_from_float16_groups'] = \ self.shard_fp32_from_float16_groups return state_dict def load_state_dict(self, state_dict): """ Load the state dict. """ # Optimizer. optimizer_key = 'optimizer' if optimizer_key not in state_dict: optimizer_key = 'optimizer_state_dict' print_rank_0('***WARNING*** loading optimizer from ' 'an old checkpoint ...') self.optimizer.load_state_dict(state_dict[optimizer_key]) # Grad scaler. if 'grad_scaler' not in state_dict: if self.fp16: print_rank_0('***WARNING*** found an old checkpoint, will not ' 'load grad scaler ...') else: if self.grad_scaler: self.grad_scaler.load_state_dict(state_dict['grad_scaler']) else: print_rank_0('***WARNING*** fould the grad scaler in the ' 'checkpoint but it is None in the class. ' 'Skipping loading grad scaler ...') # Copy data for the main params. for current_group, saved_group in zip( self.shard_fp32_from_float16_groups, state_dict["shard_fp32_from_float16_groups"]): for current_param, saved_param in zip(current_group, saved_group): current_param.data.copy_(saved_param.data) def zero_grad(self, set_to_none=True): """ Zero grads. We only need to zero the model related parameters, i.e., model_float16_groups & model_fp32_groups. We additionally zero the remaining groups as a memory optimization to reduce fragmentation; in the case of set_to_none==True, the space used by this field can be safely deallocated at this point. """ for groups in ( self.model_float16_groups, self.model_fp32_groups, self.shard_float16_groups, # grad empty/unused here? self.shard_fp32_groups, # throws grad-access warning self.shard_fp32_from_float16_groups): for group in groups: _zero_grad_group_helper(group, set_to_none) @staticmethod def get_model_buffer_dp_views(model_buffers): """ Get shard views of each of the DDP's param/grad buffers. In this nested list, the top level is grouped by the virtual model index and the buffer's data type. The sub-level is a list of shards of that buffer, where each shard in the list represents a contiguous view of the buffer, that is owned by a data-parallel rank. The shard boundary does not respect parameter boundaries, and so the elements of some parameters are split across data parallel ranks. Additionally, return references to the entire buffers, for use in reduce_scatter_tensor and _all_gather_base. """ data_parallel_world_size = mpu.get_data_parallel_world_size() # Buffer views. view_items = [] for model_index, buffers in enumerate(model_buffers): for dtype, buf in buffers.items(): assert buf.numel() % data_parallel_world_size == 0 shard_size = int(buf.numel() / data_parallel_world_size) buf_views = [buf[(r*shard_size):((r+1)*shard_size)] for r in range(data_parallel_world_size)] view_items.append((model_index, dtype, buf, buf_views)) return view_items def get_model_grad_buffer_dp_views(self): return self.get_model_buffer_dp_views([ {dtype : mem_buffer.data} for model in self.models for dtype, mem_buffer in model._grad_buffers.items()]) def get_model_param_buffer_dp_views(self): return self.get_model_buffer_dp_views(self.param_buffers) def reduce_model_grads(self, args, timers): """ Reduce-scatter model grads. The DDP's grad buffer is used for the reduce-scatter, and thus no tensors are dynamically allocated. Note: this is a different order of reduction, versus the non- distributed optimizer, which reduces: 1) layernorm grads, 2) all grads, 3) embedding grads. """ # All-reduce layer-norm grads (for sequence parallelism). timers('layernorm-grads-all-reduce', log_level=1).start( barrier=args.barrier_with_L1_time) self.allreduce_layernorm_grads(args) timers('layernorm-grads-all-reduce').stop() # All-reduce embedding grads. timers('embedding-grads-all-reduce', log_level=1).start( barrier=args.barrier_with_L1_time) self.allreduce_embedding_grads(args) timers('embedding-grads-all-reduce').stop() # Reduce-scatter setup. timers('grads-reduce-scatter', log_level=1).start( barrier=args.barrier_with_L1_time) data_parallel_rank = mpu.get_data_parallel_rank() data_parallel_world_size = mpu.get_data_parallel_world_size() data_parallel_group = mpu.get_data_parallel_group() # Scale grad buffers by '1 / data_parallel_world_size'. for model in self.models: for dtype, gbuf in model._grad_buffers.items(): gbuf.data /= data_parallel_world_size # Reduce-scatter all grads. gbuf_view_items = self.get_model_grad_buffer_dp_views() for index, (model_index, dtype, gbuf, gbuf_views) \ in enumerate(gbuf_view_items): torch.distributed.reduce_scatter_tensor( gbuf_views[data_parallel_rank], gbuf, group = data_parallel_group, ) timers('grads-reduce-scatter').stop() def gather_model_params(self, args, timers): """ All-gather updated model params. The DDP's param buffer is used for the all-gather, and thus no tensors are dynamically allocated. After the all-gather, the params can be copied from the param buffer to the param. """ timers('params-all-gather', log_level=1).start( barrier=args.barrier_with_L1_time) data_parallel_rank = mpu.get_data_parallel_rank() data_parallel_group = mpu.get_data_parallel_group() # All-gather updated main params. # - All param buffer views are guaranteed to have the same num elements # across all data parallel ranks, due to grad buffer padding that is # done in distributed.py, and extended to the param buffers. Thus, # all sub-views will have consistent start/end indexes across data # parallel ranks. pbuf_view_items = self.get_model_param_buffer_dp_views() for index, (model_index, dtype, pbuf, pbuf_views) \ in enumerate(pbuf_view_items): torch.distributed._all_gather_base( pbuf, pbuf_views[data_parallel_rank], group = data_parallel_group, ) # Copy from param buffer to each param. for model_id, model in enumerate(self.models): for dtype, param_map in model._grad_buffer_param_index_map.items(): for param, buf_range in param_map.items(): param_buf = self.param_buffers[model_id][dtype] param_buf_shard = param_buf[buf_range[0]:buf_range[1]] param.view(-1).detach().copy_(param_buf_shard) timers('params-all-gather').stop() def _collect_main_grad_data_for_unscaling(self): """ Note: this should be equivalent to the float-16 optimizer's method, but writtent differently, so the two should be combined. """ return [ param.grad.data for group in self.optimizer.param_groups for param in group["params"] ] def _get_model_and_main_params_data_float16(self): """ Get aligned list of model and main params. """ model_data = [] main_data = [] for model_group, main_group in zip(self.shard_float16_groups, self.shard_fp32_from_float16_groups): for model_param, main_param in zip(model_group, main_group): model_data.append(model_param.data) main_data.append(main_param.data) return model_data, main_data def _copy_model_grads_to_main_grads(self): """ Copy model grads to main grads. Since this step follows a reduce-scatter through the DDP's grad buffer, this method is responsible for copying the updated grads from the grad buffer to the main shard's grad field. """ # Utility method for copying group grads. def copy_group_grads(model_groups, shard_main_groups): for model_group, shard_main_group in zip(model_groups, shard_main_groups): for model_param, shard_main_param in zip(model_group, shard_main_group): param_range_map = self.get_model_param_range_map(model_param) param_range = param_range_map["param"] assert param_range.size == shard_main_param.nelement() model_grad = model_param.main_grad shard_model_grad = model_grad.view(-1) \ [param_range.start:param_range.end] shard_main_param.grad = shard_model_grad.float() # Copy model groups to shard groups. copy_group_grads(self.model_float16_groups, self.shard_fp32_from_float16_groups) copy_group_grads(self.model_fp32_groups, self.shard_fp32_groups) def _copy_main_params_to_model_params(self): """ Copy main params to model params. Since this step is followed by an all-gather through the DDP's grad buffer, this method is responsible for copying the updated params from the main shards into the correct position in the grad buffer. """ # Utility method for copying group params. def copy_group_params(shard_main_groups, model_groups): for shard_main_group, model_group in zip(shard_main_groups, model_groups): for shard_main_param, model_param in zip(shard_main_group, model_group): param_range_map = self.get_model_param_range_map(model_param) world_range = param_range_map["gbuf_world"] assert world_range.size == shard_main_param.nelement() model_id, dtype = self.model_param_gbuf_map[model_param] model_param_buffer = self.param_buffers[model_id][dtype] shard_model_param = model_param_buffer.view(-1) \ [world_range.start:world_range.end] shard_model_param.data.copy_(shard_main_param) # Copy shard groups to model groups. copy_group_params(self.shard_fp32_from_float16_groups, self.model_float16_groups) copy_group_params(self.shard_fp32_groups, self.model_fp32_groups)