[kernel] update triton init #4740 (#4740)

colossalai/kernel/triton/__init__.py

-from .context_attention import bloom_context_attn_fwd, llama_context_attn_fwd
-from .copy_kv_cache_dest import copy_kv_cache_to_dest
-from .fused_layernorm import layer_norm
-from .rms_norm import rmsnorm_forward
-from .rotary_embedding_kernel import rotary_embedding_fwd
-from .softmax import softmax
-from .token_attention_kernel import token_attention_fwd
+try:
+    import triton
+    HAS_TRITON = True
 
-__all__ = [
+    from .context_attention import bloom_context_attn_fwd, llama_context_attn_fwd
+    from .copy_kv_cache_dest import copy_kv_cache_to_dest
+    from .fused_layernorm import layer_norm
+    from .rms_norm import rmsnorm_forward
+    from .rotary_embedding_kernel import rotary_embedding_fwd
+    from .softmax import softmax
+    from .token_attention_kernel import token_attention_fwd
+
+    __all__ = [
         "llama_context_attn_fwd", "bloom_context_attn_fwd", "softmax", "layer_norm", "rmsnorm_forward",
         "copy_kv_cache_to_dest", "rotary_embedding_fwd", "token_attention_fwd"
-]
+    ]
+
+except ImportError:
+    HAS_TRITON = False
+    print("Triton is not installed. Please install Triton to use Triton kernels.")