[GitHub] [tvm] huajsj commented on a change in pull request #7345: [WIP]pipeline graph patch 1

[GitBox <gi...@apache.org>]

huajsj commented on a change in pull request #7345:
URL: https://github.com/apache/tvm/pull/7345#discussion_r613658797



##########
File path: python/tvm/relay/analysis/analysis.py
##########
@@ -448,3 +449,71 @@ def get_calibration_data(mod, data):
         calib_data[gvar] = value
 
     return calib_data
+
+
+def pipeline_graph(expr, indexs):
+    """Split Graph Into A Group Of Subgraph
+    Parameters
+    ----------
+    expr : tvm.relay.Expr
+    indexs : Array[int]
+
+    Returns
+    -------
+    ret : Array[tvm.relay.IRModule]
+    """
+
+    def run_opt_pass(expr, opt_pass):
+        """Exectue a relay pass"""
+        assert isinstance(opt_pass, tvm.transform.Pass)
+        mod = tvm.IRModule.from_expr(expr)
+        mod = tvm.relay.transform.InferType()(mod)
+        mod = opt_pass(mod)
+        entry = mod["main"]
+        return entry if isinstance(expr, tvm.relay.Function) else entry.body
+
+    def _operator_idx_inc(expr, operator_current_idx):
+        """Increase operator index"""
+        if not isinstance(expr, tvm.relay.expr.Constant):
+            operator_current_idx = operator_current_idx + 1
+
+        return operator_current_idx
+
+    def _recursion(anf, operator_indx, pipeline_mods, indexs):
+        """Do the split work"""
+        if isinstance(anf, tvm.relay.Function):
+            return tvm.relay.Function(
+                anf.params,
+                _recursion(anf.body, operator_indx, pipeline_mods, indexs),
+                anf.ret_type,
+                anf.type_params,
+                anf.attrs,
+            )
+        if isinstance(anf, tvm.relay.expr.Let):
+            value = anf.value
+            operator_indx = _operator_idx_inc(value, operator_indx)
+            if isinstance(value, tvm.relay.expr.Call):
+                if isinstance(value.op, tvm.ir.Op):
+                    if indexs and operator_indx == indexs[0]:
+                        indexs.pop(0)
+                        ann = _recursion(anf.body, operator_indx, pipeline_mods, indexs)
+                        ann = run_opt_pass(ann, transform.ToGraphNormalForm())
+                        mod = tvm.IRModule.from_expr(ann)
+                        pipeline_mods.insert(0, mod)
+                        return tvm.relay.expr.Let(anf.var, value, anf.var)

Review comment:
       for expression a(b(c(d(e)))) and indexes [0, 1, 2, 3], the result is a, b, c, d, e, that means the the first index return 
   [<express start>, <first index>], the last index return [<last index>, <express end>], comment added.




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