torsh_distributed/
deepspeed_integration.rs

1//! DeepSpeed integration for ToRSh distributed training
2//!
3//! This module provides compatibility with DeepSpeed's optimization strategies
4//! and configuration format, allowing users to migrate from PyTorch + DeepSpeed
5//! to ToRSh more easily.
6
7use crate::{TorshDistributedError, TorshResult};
8use serde::{Deserialize, Serialize};
9use std::path::Path;
10
11/// DeepSpeed ZeRO optimization stage
12#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
13pub enum ZeroStage {
14    /// Stage 0: No ZeRO optimization
15    Stage0 = 0,
16    /// Stage 1: Optimizer state partitioning
17    Stage1 = 1,
18    /// Stage 2: Gradient partitioning
19    Stage2 = 2,
20    /// Stage 3: Parameter partitioning
21    Stage3 = 3,
22}
23
24/// DeepSpeed configuration compatible with ToRSh
25#[derive(Debug, Clone, Serialize, Deserialize, Default)]
26pub struct DeepSpeedConfig {
27    /// ZeRO optimization configuration
28    pub zero_optimization: ZeroOptimizationConfig,
29    /// Gradient clipping configuration
30    pub gradient_clipping: Option<f32>,
31    /// Gradient accumulation steps
32    pub gradient_accumulation_steps: Option<u32>,
33    /// Mixed precision configuration
34    pub fp16: Option<FP16Config>,
35    /// CPU offloading configuration
36    pub zero_force_ds_cpu_optimizer: Option<bool>,
37    /// Activation checkpointing
38    pub activation_checkpointing: Option<ActivationCheckpointingConfig>,
39}
40
41/// ZeRO optimization configuration
42#[derive(Debug, Clone, Serialize, Deserialize)]
43pub struct ZeroOptimizationConfig {
44    /// ZeRO stage (0, 1, 2, or 3)
45    pub stage: ZeroStage,
46    /// Allgather bucket size
47    pub allgather_bucket_size: Option<u64>,
48    /// Reduce bucket size
49    pub reduce_bucket_size: Option<u64>,
50    /// Overlap communications
51    pub overlap_comm: Option<bool>,
52    /// Contiguous gradients
53    pub contiguous_gradients: Option<bool>,
54    /// Sub-group size
55    pub sub_group_size: Option<u32>,
56    /// Reduce scatter
57    pub reduce_scatter: Option<bool>,
58    /// Allgather partitions
59    pub allgather_partitions: Option<bool>,
60    /// Stage 3 max live parameters
61    pub stage3_max_live_parameters: Option<u64>,
62    /// Stage 3 max reuse distance
63    pub stage3_max_reuse_distance: Option<u64>,
64    /// Stage 3 prefetch bucket size
65    pub stage3_prefetch_bucket_size: Option<u64>,
66    /// Stage 3 parameter persistence threshold
67    pub stage3_param_persistence_threshold: Option<u64>,
68    /// CPU offloading configuration
69    pub offload_optimizer: Option<OffloadOptimizerConfig>,
70    /// Parameter offloading configuration
71    pub offload_param: Option<OffloadParamConfig>,
72}
73
74/// Mixed precision FP16 configuration
75#[derive(Debug, Clone, Serialize, Deserialize)]
76pub struct FP16Config {
77    /// Enable FP16 mixed precision
78    pub enabled: bool,
79    /// Loss scale
80    pub loss_scale: Option<f32>,
81    /// Dynamic loss scaling
82    pub loss_scale_window: Option<u32>,
83    /// Hysteresis for loss scaling
84    pub hysteresis: Option<u32>,
85    /// Minimum loss scale
86    pub min_loss_scale: Option<f32>,
87    /// Initial loss scale
88    pub initial_scale_power: Option<u32>,
89}
90
91/// Activation checkpointing configuration
92#[derive(Debug, Clone, Serialize, Deserialize)]
93pub struct ActivationCheckpointingConfig {
94    /// Enable activation checkpointing
95    pub partition_activations: Option<bool>,
96    /// CPU checkpointing
97    pub cpu_checkpointing: Option<bool>,
98    /// Contiguous memory optimization
99    pub contiguous_memory_optimization: Option<bool>,
100    /// Number of checkpoints
101    pub number_checkpoints: Option<u32>,
102    /// Synchronize checkpoint boundary
103    pub synchronize_checkpoint_boundary: Option<bool>,
104    /// Profile
105    pub profile: Option<bool>,
106}
107
108/// Optimizer offloading configuration
109#[derive(Debug, Clone, Serialize, Deserialize)]
110pub struct OffloadOptimizerConfig {
111    /// Device to offload to
112    pub device: String,
113    /// NVME path for ultra-fast offloading
114    pub nvme_path: Option<String>,
115    /// Pin memory
116    pub pin_memory: Option<bool>,
117    /// Buffer count
118    pub buffer_count: Option<u32>,
119    /// Fast initialization
120    pub fast_init: Option<bool>,
121}
122
123/// Parameter offloading configuration
124#[derive(Debug, Clone, Serialize, Deserialize)]
125pub struct OffloadParamConfig {
126    /// Device to offload to
127    pub device: String,
128    /// NVME path for ultra-fast offloading
129    pub nvme_path: Option<String>,
130    /// Pin memory
131    pub pin_memory: Option<bool>,
132    /// Buffer count
133    pub buffer_count: Option<u32>,
134    /// Max parameters per GPU
135    pub max_in_cpu: Option<u64>,
136}
137
138/// DeepSpeed integration manager
139pub struct DeepSpeedIntegration {
140    config: DeepSpeedConfig,
141    initialized: bool,
142}
143
144impl DeepSpeedIntegration {
145    /// Create a new DeepSpeed integration instance
146    pub fn new(config: DeepSpeedConfig) -> Self {
147        Self {
148            config,
149            initialized: false,
150        }
151    }
152
153    /// Load DeepSpeed configuration from file
154    pub fn from_file<P: AsRef<Path>>(path: P) -> TorshResult<Self> {
155        let content = std::fs::read_to_string(path).map_err(|e| {
156            TorshDistributedError::configuration_error(format!(
157                "Failed to read DeepSpeed config file: {}",
158                e
159            ))
160        })?;
161
162        let config: DeepSpeedConfig = serde_json::from_str(&content).map_err(|e| {
163            TorshDistributedError::configuration_error(format!(
164                "Failed to parse DeepSpeed config: {}",
165                e
166            ))
167        })?;
168
169        Ok(Self::new(config))
170    }
171
172    /// Load DeepSpeed configuration from JSON string
173    pub fn from_json(json: &str) -> TorshResult<Self> {
174        let config: DeepSpeedConfig = serde_json::from_str(json).map_err(|e| {
175            TorshDistributedError::configuration_error(format!(
176                "Failed to parse DeepSpeed config: {}",
177                e
178            ))
179        })?;
180
181        Ok(Self::new(config))
182    }
183
184    /// Initialize DeepSpeed integration
185    pub fn initialize(&mut self) -> TorshResult<()> {
186        if self.initialized {
187            return Ok(());
188        }
189
190        // Validate configuration
191        self.validate_config()?;
192
193        // Initialize based on ZeRO stage
194        match self.config.zero_optimization.stage {
195            ZeroStage::Stage0 => {
196                // No ZeRO optimization
197                tracing::info!(
198                    "DeepSpeed integration initialized with ZeRO Stage 0 (no optimization)"
199                );
200            }
201            ZeroStage::Stage1 => {
202                // Optimizer state partitioning
203                self.initialize_zero_stage1()?;
204            }
205            ZeroStage::Stage2 => {
206                // Gradient partitioning
207                self.initialize_zero_stage2()?;
208            }
209            ZeroStage::Stage3 => {
210                // Parameter partitioning
211                self.initialize_zero_stage3()?;
212            }
213        }
214
215        self.initialized = true;
216        Ok(())
217    }
218
219    /// Validate DeepSpeed configuration
220    fn validate_config(&self) -> TorshResult<()> {
221        // Validate ZeRO stage
222        if matches!(self.config.zero_optimization.stage, ZeroStage::Stage3)
223            && self
224                .config
225                .zero_optimization
226                .stage3_max_live_parameters
227                .is_none()
228        {
229            return Err(TorshDistributedError::configuration_error(
230                "ZeRO Stage 3 requires stage3_max_live_parameters to be set",
231            ));
232        }
233
234        // Validate offloading configuration
235        if let Some(ref offload_config) = self.config.zero_optimization.offload_optimizer {
236            if offload_config.device.is_empty() {
237                return Err(TorshDistributedError::configuration_error(
238                    "Offload optimizer device cannot be empty",
239                ));
240            }
241        }
242
243        if let Some(ref offload_config) = self.config.zero_optimization.offload_param {
244            if offload_config.device.is_empty() {
245                return Err(TorshDistributedError::configuration_error(
246                    "Offload parameter device cannot be empty",
247                ));
248            }
249        }
250
251        Ok(())
252    }
253
254    /// Initialize ZeRO Stage 1 (optimizer state partitioning)
255    fn initialize_zero_stage1(&self) -> TorshResult<()> {
256        tracing::info!("Initializing DeepSpeed ZeRO Stage 1 (optimizer state partitioning)");
257
258        // Configure optimizer state partitioning
259        let bucket_size = self
260            .config
261            .zero_optimization
262            .reduce_bucket_size
263            .unwrap_or(2e8 as u64);
264        tracing::debug!("ZeRO Stage 1 - Reduce bucket size: {}", bucket_size);
265
266        Ok(())
267    }
268
269    /// Initialize ZeRO Stage 2 (gradient partitioning)
270    fn initialize_zero_stage2(&self) -> TorshResult<()> {
271        tracing::info!("Initializing DeepSpeed ZeRO Stage 2 (gradient partitioning)");
272
273        // Configure gradient partitioning
274        let allgather_bucket_size = self
275            .config
276            .zero_optimization
277            .allgather_bucket_size
278            .unwrap_or(2e8 as u64);
279        let reduce_bucket_size = self
280            .config
281            .zero_optimization
282            .reduce_bucket_size
283            .unwrap_or(2e8 as u64);
284        let overlap_comm = self.config.zero_optimization.overlap_comm.unwrap_or(true);
285
286        tracing::debug!(
287            "ZeRO Stage 2 - Allgather bucket size: {}",
288            allgather_bucket_size
289        );
290        tracing::debug!("ZeRO Stage 2 - Reduce bucket size: {}", reduce_bucket_size);
291        tracing::debug!("ZeRO Stage 2 - Overlap communication: {}", overlap_comm);
292
293        Ok(())
294    }
295
296    /// Initialize ZeRO Stage 3 (parameter partitioning)
297    fn initialize_zero_stage3(&self) -> TorshResult<()> {
298        tracing::info!("Initializing DeepSpeed ZeRO Stage 3 (parameter partitioning)");
299
300        // Configure parameter partitioning
301        let max_live_params = self
302            .config
303            .zero_optimization
304            .stage3_max_live_parameters
305            .unwrap_or(1e9 as u64);
306        let max_reuse_distance = self
307            .config
308            .zero_optimization
309            .stage3_max_reuse_distance
310            .unwrap_or(1000);
311        let prefetch_bucket_size = self
312            .config
313            .zero_optimization
314            .stage3_prefetch_bucket_size
315            .unwrap_or(5e8 as u64);
316
317        tracing::debug!("ZeRO Stage 3 - Max live parameters: {}", max_live_params);
318        tracing::debug!("ZeRO Stage 3 - Max reuse distance: {}", max_reuse_distance);
319        tracing::debug!(
320            "ZeRO Stage 3 - Prefetch bucket size: {}",
321            prefetch_bucket_size
322        );
323
324        Ok(())
325    }
326
327    /// Get the current configuration
328    pub fn config(&self) -> &DeepSpeedConfig {
329        &self.config
330    }
331
332    /// Check if DeepSpeed integration is initialized
333    pub fn is_initialized(&self) -> bool {
334        self.initialized
335    }
336
337    /// Convert DeepSpeed config to ToRSh FSDP config
338    pub fn to_fsdp_config(&self) -> TorshResult<crate::fsdp::FsdpConfig> {
339        use crate::fsdp::{FsdpConfig, MixedPrecisionConfig, ShardingStrategy};
340
341        let sharding_strategy = match self.config.zero_optimization.stage {
342            ZeroStage::Stage0 => ShardingStrategy::NoShard,
343            ZeroStage::Stage1 => ShardingStrategy::ShardGradOp,
344            ZeroStage::Stage2 => ShardingStrategy::ShardGradOp,
345            ZeroStage::Stage3 => ShardingStrategy::FullShard,
346        };
347
348        let mixed_precision = if let Some(ref fp16_config) = self.config.fp16 {
349            if fp16_config.enabled {
350                Some(MixedPrecisionConfig {
351                    param_dtype: torsh_core::DType::F16,
352                    reduce_dtype: torsh_core::DType::F16,
353                    buffer_dtype: torsh_core::DType::F16,
354                    keep_low_precision_grads: false,
355                })
356            } else {
357                None
358            }
359        } else {
360            None
361        };
362
363        Ok(FsdpConfig {
364            min_num_params: 1000,
365            auto_wrap_policy: crate::fsdp::AutoWrapPolicy::SizeBasedAutoWrap {
366                min_num_params: 1000,
367            },
368            sharding_strategy,
369            mixed_precision,
370            cpu_offload: self.config.zero_optimization.offload_optimizer.is_some()
371                || self.config.zero_optimization.offload_param.is_some(),
372            memory_config: crate::fsdp::MemoryConfig::default(),
373            backward_prefetch: crate::fsdp::BackwardPrefetch::BackwardPre,
374        })
375    }
376
377    /// Convert DeepSpeed config to ToRSh gradient compression config
378    pub fn to_gradient_compression_config(
379        &self,
380    ) -> Option<crate::gradient_compression::CompressionConfig> {
381        // DeepSpeed doesn't have direct gradient compression config, but we can infer from ZeRO settings
382        if self
383            .config
384            .zero_optimization
385            .reduce_scatter
386            .unwrap_or(false)
387        {
388            Some(crate::gradient_compression::CompressionConfig {
389                method: crate::gradient_compression::CompressionMethod::TopK { k: 0.1 },
390                compression_ratio: 0.1,
391                error_feedback: true,
392                error_feedback_momentum: 0.9,
393                memory_efficient: true,
394                warmup_steps: 5,
395            })
396        } else {
397            None
398        }
399    }
400
401    /// Get performance statistics
402    pub fn get_stats(&self) -> DeepSpeedStats {
403        DeepSpeedStats {
404            zero_stage: self.config.zero_optimization.stage,
405            initialized: self.initialized,
406            fp16_enabled: self
407                .config
408                .fp16
409                .as_ref()
410                .map(|c| c.enabled)
411                .unwrap_or(false),
412            cpu_offload_enabled: self.config.zero_force_ds_cpu_optimizer.unwrap_or(false),
413            activation_checkpointing_enabled: self
414                .config
415                .activation_checkpointing
416                .as_ref()
417                .map(|c| c.partition_activations.unwrap_or(false))
418                .unwrap_or(false),
419        }
420    }
421}
422
423impl Default for DeepSpeedIntegration {
424    fn default() -> Self {
425        Self::new(DeepSpeedConfig::default())
426    }
427}
428
429/// DeepSpeed performance statistics
430#[derive(Debug, Clone)]
431pub struct DeepSpeedStats {
432    /// ZeRO optimization stage
433    pub zero_stage: ZeroStage,
434    /// Whether DeepSpeed is initialized
435    pub initialized: bool,
436    /// Whether FP16 is enabled
437    pub fp16_enabled: bool,
438    /// Whether CPU offloading is enabled
439    pub cpu_offload_enabled: bool,
440    /// Whether activation checkpointing is enabled
441    pub activation_checkpointing_enabled: bool,
442}
443
444impl Default for ZeroOptimizationConfig {
445    fn default() -> Self {
446        Self {
447            stage: ZeroStage::Stage0,
448            allgather_bucket_size: None,
449            reduce_bucket_size: None,
450            overlap_comm: None,
451            contiguous_gradients: None,
452            sub_group_size: None,
453            reduce_scatter: None,
454            allgather_partitions: None,
455            stage3_max_live_parameters: None,
456            stage3_max_reuse_distance: None,
457            stage3_prefetch_bucket_size: None,
458            stage3_param_persistence_threshold: None,
459            offload_optimizer: None,
460            offload_param: None,
461        }
462    }
463}
464
465/// Utility functions for DeepSpeed integration
466pub mod utils {
467    use super::*;
468
469    /// Create a basic DeepSpeed configuration for ZeRO Stage 1
470    pub fn create_zero_stage1_config() -> DeepSpeedConfig {
471        DeepSpeedConfig {
472            zero_optimization: ZeroOptimizationConfig {
473                stage: ZeroStage::Stage1,
474                overlap_comm: Some(true),
475                contiguous_gradients: Some(true),
476                reduce_bucket_size: Some(2e8 as u64),
477                ..Default::default()
478            },
479            ..Default::default()
480        }
481    }
482
483    /// Create a basic DeepSpeed configuration for ZeRO Stage 2
484    pub fn create_zero_stage2_config() -> DeepSpeedConfig {
485        DeepSpeedConfig {
486            zero_optimization: ZeroOptimizationConfig {
487                stage: ZeroStage::Stage2,
488                overlap_comm: Some(true),
489                contiguous_gradients: Some(true),
490                reduce_bucket_size: Some(2e8 as u64),
491                allgather_bucket_size: Some(2e8 as u64),
492                ..Default::default()
493            },
494            ..Default::default()
495        }
496    }
497
498    /// Create a basic DeepSpeed configuration for ZeRO Stage 3
499    pub fn create_zero_stage3_config() -> DeepSpeedConfig {
500        DeepSpeedConfig {
501            zero_optimization: ZeroOptimizationConfig {
502                stage: ZeroStage::Stage3,
503                overlap_comm: Some(true),
504                contiguous_gradients: Some(true),
505                reduce_bucket_size: Some(2e8 as u64),
506                allgather_bucket_size: Some(2e8 as u64),
507                stage3_max_live_parameters: Some(1e9 as u64),
508                stage3_max_reuse_distance: Some(1000),
509                stage3_prefetch_bucket_size: Some(5e8 as u64),
510                stage3_param_persistence_threshold: Some(1e6 as u64),
511                ..Default::default()
512            },
513            ..Default::default()
514        }
515    }
516
517    /// Create a DeepSpeed configuration with FP16 mixed precision
518    pub fn create_fp16_config() -> DeepSpeedConfig {
519        DeepSpeedConfig {
520            zero_optimization: ZeroOptimizationConfig {
521                stage: ZeroStage::Stage2,
522                overlap_comm: Some(true),
523                contiguous_gradients: Some(true),
524                reduce_bucket_size: Some(2e8 as u64),
525                allgather_bucket_size: Some(2e8 as u64),
526                ..Default::default()
527            },
528            fp16: Some(FP16Config {
529                enabled: true,
530                loss_scale: None,
531                loss_scale_window: Some(1000),
532                hysteresis: Some(2),
533                min_loss_scale: Some(1.0),
534                initial_scale_power: Some(16),
535            }),
536            ..Default::default()
537        }
538    }
539
540    /// Create a DeepSpeed configuration with CPU offloading
541    pub fn create_cpu_offload_config() -> DeepSpeedConfig {
542        DeepSpeedConfig {
543            zero_optimization: ZeroOptimizationConfig {
544                stage: ZeroStage::Stage3,
545                overlap_comm: Some(true),
546                contiguous_gradients: Some(true),
547                reduce_bucket_size: Some(2e8 as u64),
548                allgather_bucket_size: Some(2e8 as u64),
549                stage3_max_live_parameters: Some(1e9 as u64),
550                stage3_max_reuse_distance: Some(1000),
551                stage3_prefetch_bucket_size: Some(5e8 as u64),
552                stage3_param_persistence_threshold: Some(1e6 as u64),
553                offload_optimizer: Some(OffloadOptimizerConfig {
554                    device: "cpu".to_string(),
555                    nvme_path: None,
556                    pin_memory: Some(false),
557                    buffer_count: Some(4),
558                    fast_init: Some(false),
559                }),
560                offload_param: Some(OffloadParamConfig {
561                    device: "cpu".to_string(),
562                    nvme_path: None,
563                    pin_memory: Some(false),
564                    buffer_count: Some(4),
565                    max_in_cpu: Some(1e9 as u64),
566                }),
567                ..Default::default()
568            },
569            zero_force_ds_cpu_optimizer: Some(true),
570            ..Default::default()
571        }
572    }
573}
574
575#[cfg(test)]
576mod tests {
577    use super::*;
578
579    #[test]
580    fn test_deepspeed_config_serialization() {
581        let config = utils::create_zero_stage2_config();
582        let json = serde_json::to_string(&config).unwrap();
583        let deserialized: DeepSpeedConfig = serde_json::from_str(&json).unwrap();
584
585        assert_eq!(
586            config.zero_optimization.stage,
587            deserialized.zero_optimization.stage
588        );
589        assert_eq!(
590            config.zero_optimization.overlap_comm,
591            deserialized.zero_optimization.overlap_comm
592        );
593    }
594
595    #[test]
596    fn test_deepspeed_integration_initialization() {
597        let config = utils::create_zero_stage1_config();
598        let mut integration = DeepSpeedIntegration::new(config);
599
600        assert!(!integration.is_initialized());
601        integration.initialize().unwrap();
602        assert!(integration.is_initialized());
603    }
604
605    #[test]
606    fn test_deepspeed_to_fsdp_config() {
607        let config = utils::create_zero_stage3_config();
608        let integration = DeepSpeedIntegration::new(config);
609        let fsdp_config = integration.to_fsdp_config().unwrap();
610
611        assert_eq!(
612            fsdp_config.sharding_strategy,
613            crate::fsdp::ShardingStrategy::FullShard
614        );
615    }
616
617    #[test]
618    fn test_deepspeed_stats() {
619        let config = utils::create_fp16_config();
620        let integration = DeepSpeedIntegration::new(config);
621        let stats = integration.get_stats();
622
623        assert_eq!(stats.zero_stage, ZeroStage::Stage2);
624        assert!(!stats.initialized);
625        assert!(stats.fp16_enabled); // FP16 is enabled in config
626    }
627
628    #[test]
629    fn test_deepspeed_config_validation() {
630        let mut config = utils::create_zero_stage3_config();
631        config.zero_optimization.stage3_max_live_parameters = None;
632
633        let mut integration = DeepSpeedIntegration::new(config);
634        assert!(integration.initialize().is_err());
635    }
636}
torsh_distributed/deepspeed_integration.rs

torsh_distributed/
deepspeed_integration.rs
