Added skip_zeros; tests are passing.

Makefile

@@ -15,29 +15,31 @@ INCLUDE :=  -I $(CUDA_HOME)/include -I $(ROOT_DIR)/csrc -I $(CONDA_PREFIX)/inclu
 LIB := -L $(CUDA_HOME)/lib64 -lcudart -lcuda -lcublas -lcurand -lcusparse -L $(CONDA_PREFIX)/lib
 
 # NVIDIA NVCC compilation flags
-COMPUTE_CAPABILITY := -gencode arch=compute_35,code=sm_35 # Kepler 
-COMPUTE_CAPABILITY += -gencode arch=compute_37,code=sm_37 # Kepler 
-COMPUTE_CAPABILITY += -gencode arch=compute_50,code=sm_50 # Maxwell
-COMPUTE_CAPABILITY += -gencode arch=compute_52,code=sm_52 # Maxwell
-COMPUTE_CAPABILITY += -gencode arch=compute_60,code=sm_60 # Pascal
-COMPUTE_CAPABILITY += -gencode arch=compute_61,code=sm_61 # Pascal
-COMPUTE_CAPABILITY += -gencode arch=compute_70,code=sm_70 # Volta
-COMPUTE_CAPABILITY += -gencode arch=compute_72,code=sm_72 # Volta 
-COMPUTE_CAPABILITY += -gencode arch=compute_72,code=sm_72 # Volta 
-
-# CUDA 9.2 supports CC 3.0, but CUDA >= 11.0 does not
-CC_CUDA92 := -gencode arch=compute_30,code=sm_30
-
-# Later versions of CUDA support the new architectures
-CC_CUDA10x := -gencode arch=compute_30,code=sm_30
-CC_CUDA10x += -gencode arch=compute_75,code=sm_75
-
-CC_CUDA110 := -gencode arch=compute_75,code=sm_75
-CC_CUDA110 += -gencode arch=compute_80,code=sm_80
-
-CC_CUDA11x := -gencode arch=compute_75,code=sm_75
-CC_CUDA11x += -gencode arch=compute_80,code=sm_80
-CC_CUDA11x += -gencode arch=compute_86,code=sm_86
+#COMPUTE_CAPABILITY := -gencode arch=compute_35,code=sm_35 # Kepler 
+#COMPUTE_CAPABILITY += -gencode arch=compute_37,code=sm_37 # Kepler 
+#COMPUTE_CAPABILITY += -gencode arch=compute_50,code=sm_50 # Maxwell
+#COMPUTE_CAPABILITY += -gencode arch=compute_52,code=sm_52 # Maxwell
+#COMPUTE_CAPABILITY += -gencode arch=compute_60,code=sm_60 # Pascal
+#COMPUTE_CAPABILITY += -gencode arch=compute_61,code=sm_61 # Pascal
+#COMPUTE_CAPABILITY += -gencode arch=compute_70,code=sm_70 # Volta
+#COMPUTE_CAPABILITY += -gencode arch=compute_72,code=sm_72 # Volta 
+#COMPUTE_CAPABILITY += -gencode arch=compute_72,code=sm_72 # Volta 
+#
+## CUDA 9.2 supports CC 3.0, but CUDA >= 11.0 does not
+#CC_CUDA92 := -gencode arch=compute_30,code=sm_30
+#
+## Later versions of CUDA support the new architectures
+#CC_CUDA10x := -gencode arch=compute_30,code=sm_30
+#CC_CUDA10x += -gencode arch=compute_75,code=sm_75
+#
+#CC_CUDA110 := -gencode arch=compute_75,code=sm_75
+#CC_CUDA110 += -gencode arch=compute_80,code=sm_80
+#
+#CC_CUDA11x := -gencode arch=compute_75,code=sm_75
+#CC_CUDA11x += -gencode arch=compute_80,code=sm_80
+#CC_CUDA11x += -gencode arch=compute_86,code=sm_86
+
+COMPUTE_CAPABILITY := -gencode arch=compute_70,code=sm_70 # Volta
 
 
 all: $(ROOT_DIR)/dependencies/cub $(BUILD_DIR)

bitsandbytes/functional.py

@@ -486,13 +486,13 @@ def optimizer_update_8bit_blockwise(optimizer_name: str, g: Tensor, p: Tensor, s
         str2optimizer8bit_blockwise[optimizer_name][0](get_ptr(p), get_ptr(g), get_ptr(state1), get_ptr(state2),
                     ct.c_float(beta1), ct.c_float(beta2), ct.c_float(eps),
                     ct.c_int32(step), ct.c_float(lr), get_ptr(qmap1), get_ptr(qmap2),
-                    get_ptr(absmax1), get_ptr(absmax2), ct.c_float(weight_decay), ct.c_float(gnorm_scale), 
+                    get_ptr(absmax1), get_ptr(absmax2), ct.c_float(weight_decay), ct.c_float(gnorm_scale),
                     ct.c_bool(skip_zeros), ct.c_int32(g.numel()))
     elif g.dtype == torch.float16 and state1.dtype == torch.uint8:
         str2optimizer8bit_blockwise[optimizer_name][1](get_ptr(p), get_ptr(g), get_ptr(state1), get_ptr(state2),
                     ct.c_float(beta1), ct.c_float(beta2), ct.c_float(eps),
                     ct.c_int32(step), ct.c_float(lr), get_ptr(qmap1), get_ptr(qmap2),
-                    get_ptr(absmax1), get_ptr(absmax2), ct.c_float(weight_decay), ct.c_float(gnorm_scale), 
+                    get_ptr(absmax1), get_ptr(absmax2), ct.c_float(weight_decay), ct.c_float(gnorm_scale),
                     ct.c_bool(skip_zeros), ct.c_int32(g.numel()))
     else:
         raise ValueError(f'Gradient+optimizer bit data type combination not supported: grad {g.dtype}, optimizer {state1.dtype}')

bitsandbytes/optim/optimizer.py

@@ -336,7 +336,7 @@ class Optimizer2State(Optimizer8bit):
         if state['state1'].dtype == torch.float:
             F.optimizer_update_32bit(self.optimizer_name, grad, p, state['state1'], config['betas'][0], config['eps'], step, config['lr'],
                     state['state2'], config['betas'][1], config['weight_decay'], gnorm_scale,
-                    state['unorm_vec'] if config['max_unorm'] > 0.0 else None, max_unorm=config['max_unorm'])
+                    state['unorm_vec'] if config['max_unorm'] > 0.0 else None, max_unorm=config['max_unorm'], skip_zeros=config['skip_zeros'])
 
         elif state['state1'].dtype == torch.uint8 and not config['block_wise']:
             F.optimizer_update_8bit(self.optimizer_name, grad, p, state['state1'], state['state2'], config['betas'][0], config['betas'][1],
@@ -352,7 +352,7 @@ class Optimizer2State(Optimizer8bit):
             F.optimizer_update_8bit_blockwise(self.optimizer_name, grad, p, state['state1'], state['state2'], config['betas'][0], config['betas'][1],
                           config['eps'],  step, config['lr'],
                           state['qmap1'], state['qmap2'], state['absmax1'], state['absmax2'],
-                          config['weight_decay'], gnorm_scale=gnorm_scale)
+                          config['weight_decay'], gnorm_scale=gnorm_scale, skip_zeros=config['skip_zeros'])
 
 
 class Optimizer1State(Optimizer8bit):
@@ -450,7 +450,7 @@ class Optimizer1State(Optimizer8bit):
             F.optimizer_update_32bit(self.optimizer_name, grad, p, state['state1'], config['betas'][0], config['eps'], step, config['lr'],
                     None, 0.0, config['weight_decay'], gnorm_scale,
                     state['unorm_vec'] if config['max_unorm'] > 0.0 else None, max_unorm=config['max_unorm'],
-                    skip_zeros=False)
+                    skip_zeros=config['skip_zeros'])
 
         elif state['state1'].dtype == torch.uint8 and not config['block_wise']:
             F.optimizer_update_8bit(self.optimizer_name, grad, p, state['state1'], None, config['betas'][0], config['betas'][1],
@@ -463,4 +463,4 @@ class Optimizer1State(Optimizer8bit):
             F.optimizer_update_8bit_blockwise(self.optimizer_name, grad, p, state['state1'], None, config['betas'][0], config['betas'][1],
                           config['eps'],  step, config['lr'],
                           state['qmap1'], None, state['absmax1'], None,
-                          config['weight_decay'], gnorm_scale=gnorm_scale, skip_zeros=False)
+                          config['weight_decay'], gnorm_scale=gnorm_scale, skip_zeros=config['skip_zeros'])

csrc/kernels.cu

@@ -715,9 +715,12 @@ __global__ void kOptimizer32bit2State(T* g, T* p,
           switch(OPTIMIZER)
           {
               case ADAM: 
-                  s1_vals[j] = s1_vals[j]*beta1 + ((1.0f -beta1)*((float)g_vals[j]));
-                  s2_vals[j] = s2_vals[j]*beta2 + ((1.0f -beta2)*(((float)g_vals[j])*((float)g_vals[j])));
-                  p_vals[j] = ((float)p_vals[j]) + (update_scale*step_size*(s1_vals[j]/(sqrtf(s2_vals[j])+(eps*correction2))));
+									if(!skip_zeros || (skip_zeros && g_vals[j] != (T)0.0))
+									{
+										s1_vals[j] = s1_vals[j]*beta1 + ((1.0f -beta1)*((float)g_vals[j]));
+										s2_vals[j] = s2_vals[j]*beta2 + ((1.0f -beta2)*(((float)g_vals[j])*((float)g_vals[j])));
+										p_vals[j] = ((float)p_vals[j]) + (update_scale*step_size*(s1_vals[j]/(sqrtf(s2_vals[j])+(eps*correction2))));
+									}
                   break;
           }
       }
@@ -865,21 +868,24 @@ __global__ void kOptimizer32bit1State(T *g, T *p,
       # pragma unroll 4
       for(unsigned int j = 0; j < NUM_PER_THREAD; j++)
       {
-          switch(OPTIMIZER)
-          {
-              case MOMENTUM: 
-                  if(step == 1)
-                    s1_vals[j] = (float)g_vals[j];
-                  else
-                    s1_vals[j] = s1_vals[j]*beta1 + ((float)g_vals[j]);
-
-                  p_vals[j] = ((float)p_vals[j]) + update_scale*(-lr*(s1_vals[j]));
-                  break;
-              case RMSPROP: 
-                  s1_vals[j] = s1_vals[j]*beta1 + ((1.0f-beta1)*((float)g_vals[j])*((float)g_vals[j]));
-                  p_vals[j] = ((float)p_vals[j]) - update_scale*(lr*__fdividef((float)g_vals[j],sqrtf((float)s1_vals[j])+eps));
-                  break;
-          }
+					if(!skip_zeros || (skip_zeros && g_vals[j] != (T)0.0))
+					{
+						switch(OPTIMIZER)
+						{
+								case MOMENTUM: 
+										if(step == 1)
+											s1_vals[j] = (float)g_vals[j];
+										else
+											s1_vals[j] = s1_vals[j]*beta1 + ((float)g_vals[j]);
+
+										p_vals[j] = ((float)p_vals[j]) + update_scale*(-lr*(s1_vals[j]));
+										break;
+								case RMSPROP: 
+										s1_vals[j] = s1_vals[j]*beta1 + ((1.0f-beta1)*((float)g_vals[j])*((float)g_vals[j]));
+										p_vals[j] = ((float)p_vals[j]) - update_scale*(lr*__fdividef((float)g_vals[j],sqrtf((float)s1_vals[j])+eps));
+										break;
+						}
+					}
       }
 
       __syncthreads();
@@ -1469,11 +1475,14 @@ kOptimizerStatic8bit2StateBlockwise(T* p, T* __restrict__ const g, unsigned char
         {
             g_val = float(g_vals[j]);
             g_val *= gnorm_scale;
-            s1_vals[j] = smem_quantiles1[lane_id][c1s[j]]*absmax1[i/BLOCK_SIZE];
-            s1_vals[j] = (s1_vals[j]*beta1) + (((1.0f-beta1)*g_val));
+						if(!skip_zeros || (skip_zeros && g_vals[j] != (T)0.0))
+						{
+							s1_vals[j] = smem_quantiles1[lane_id][c1s[j]]*absmax1[i/BLOCK_SIZE];
+							s1_vals[j] = (s1_vals[j]*beta1) + (((1.0f-beta1)*g_val));
 
-            s2_vals[j] = smem_quantiles2[lane_id][c2s[j]]*absmax2[i/BLOCK_SIZE];
-            s2_vals[j] = (s2_vals[j]*beta2) + (((1.0f-beta2)*g_val*g_val));
+							s2_vals[j] = smem_quantiles2[lane_id][c2s[j]]*absmax2[i/BLOCK_SIZE];
+							s2_vals[j] = (s2_vals[j]*beta2) + (((1.0f-beta2)*g_val*g_val));
+						}
 
             new_local_abs_max1 = fmaxf(new_local_abs_max1, fabsf(s1_vals[j]));
             new_local_abs_max2 = fmaxf(new_local_abs_max2, fabsf(s2_vals[j]));
@@ -1509,9 +1518,12 @@ kOptimizerStatic8bit2StateBlockwise(T* p, T* __restrict__ const g, unsigned char
         # pragma unroll N_PER_TH
         for(unsigned int j = 0; j < N_PER_TH; j++)
         {
-            g_vals[j] = (T)(((float)g_vals[j]) + ((step_size*(__fdividef(s1_vals[j],(sqrtf(s2_vals[j])+(correction2*eps)))))));
-            if(weight_decay > 0.0f)
-                g_vals[j] = ((float)g_vals[j])*(1.0f-(lr*weight_decay));
+						if(!skip_zeros || (skip_zeros && g_vals[j] != (T)0.0))
+						{
+							g_vals[j] = (T)(((float)g_vals[j]) + ((step_size*(__fdividef(s1_vals[j],(sqrtf(s2_vals[j])+(correction2*eps)))))));
+							if(weight_decay > 0.0f)
+									g_vals[j] = ((float)g_vals[j])*(1.0f-(lr*weight_decay));
+						}
         }
 
         //  store: 0.85/1.44 -> 2.48/1.57
@@ -1623,23 +1635,26 @@ kOptimizerStatic8bit1StateBlockwise(T* p, T* __restrict__ const g, unsigned char
         {
             g_val = float(g_vals[j]);
             g_val *= gnorm_scale;
-            if(weight_decay > 0.0f)
-              g_val += ((float)p_vals[j])*weight_decay;
-
-						s1_vals[j] = smem_quantiles1[lane_id][c1s[j]]*absmax1[i/BLOCK_SIZE];
-
-            switch(OPTIMIZER)
-            {
-                case MOMENTUM: 
-                  if(step == 1)
-                    s1_vals[j] = g_val;
-                  else
-										s1_vals[j] = (s1_vals[j]*beta1) + g_val;
-                  break;
-								case RMSPROP: 
-									s1_vals[j] = s1_vals[j]*beta1 + ((1.0f-beta1)*(g_val*g_val));
-									break;
-            }
+						if(!skip_zeros || (skip_zeros && g_vals[j] != (T)0.0))
+						{
+							if(weight_decay > 0.0f)
+								g_val += ((float)p_vals[j])*weight_decay;
+
+							s1_vals[j] = smem_quantiles1[lane_id][c1s[j]]*absmax1[i/BLOCK_SIZE];
+
+							switch(OPTIMIZER)
+							{
+									case MOMENTUM: 
+										if(step == 1)
+											s1_vals[j] = g_val;
+										else
+											s1_vals[j] = (s1_vals[j]*beta1) + g_val;
+										break;
+									case RMSPROP: 
+										s1_vals[j] = s1_vals[j]*beta1 + ((1.0f-beta1)*(g_val*g_val));
+										break;
+							}
+						}
 
             new_local_abs_max1 = fmaxf(new_local_abs_max1, fabsf(s1_vals[j]));
         }
@@ -1662,16 +1677,19 @@ kOptimizerStatic8bit1StateBlockwise(T* p, T* __restrict__ const g, unsigned char
         # pragma unroll N_PER_TH
         for(unsigned int j = 0; j < N_PER_TH; j++)
 				{
-            switch(OPTIMIZER)
-            {
-                case MOMENTUM: 
-									p_vals[j] = ((float)p_vals[j]) - lr*(s1_vals[j]);
-									break;
-								case RMSPROP: 
-									g_val = g_vals[j];
-									p_vals[j] = ((float)p_vals[j]) - lr*(__fdividef(g_val, sqrtf(s1_vals[j])+eps));
-									break;
-            }
+						if(!skip_zeros || (skip_zeros && g_vals[j] != (T)0.0))
+						{
+							switch(OPTIMIZER)
+							{
+									case MOMENTUM: 
+										p_vals[j] = ((float)p_vals[j]) - lr*(s1_vals[j]);
+										break;
+									case RMSPROP: 
+										g_val = g_vals[j];
+										p_vals[j] = ((float)p_vals[j]) - lr*(__fdividef(g_val, sqrtf(s1_vals[j])+eps));
+										break;
+							}
+						}
 				}
 
         //  store: 0.85/1.44 -> 2.48/1.57

csrc/pythonInterface.c

@@ -110,7 +110,7 @@ extern "C"
                 float eps, int step, float lr,  \
                 float* quantiles1, float* quantiles2, \
                 float* max1, float* max2, float* new_max1, float* new_max2, \
-                float weight_decay, float gnorm_scale, bool skip_zeros, int n) \
+                float weight_decay, float gnorm_scale, int n) \
   {  \
 	    name##_static_8bit_g##gbits(g, p, state1, state2, unorm, max_unorm, param_norm, beta1, beta2, eps, step, lr, \
 			                                 quantiles1, quantiles2, max1, max2, new_max1, new_max2, weight_decay, gnorm_scale, n); \