ones_like and zeros_like dtype parameter is documented

doc/library/tensor/basic.txt

@@ -664,17 +664,22 @@ Creating Tensor
 ===============
 
 
-.. function:: zeros_like(x)
+.. function:: zeros_like(x, dtype=None)
 
-    :param x: tensor that has same shape as output
+    :param x: tensor that has the same shape as output
+    :param dtype: data-type, optional
 
-    Returns a tensor filled with 0s that has same shape as `x`.
+    Returns a tensor the shape of x filled with zeros of the type of dtype.
+    
 
 .. function:: ones_like(x)
 
-    :param x: tensor that has same shape as output
-
-    Returns a tensor filled with 1s that has same shape as `x`.
+  
+    :param x: tensor that has the same shape as output
+    :param dtype: data-type, optional
+  
+    Returns a tensor the shape of x filled with ones of the type of dtype.
+      
 
 .. function:: fill(a,b)
 

theano/tensor/basic.py

@@ -2260,7 +2260,17 @@ pprint.assign(fill, printing.FunctionPrinter('fill'))
 
 @constructor
 def ones_like(model, dtype=None):
-    """equivalent of numpy.ones_like"""
+    """equivalent of numpy.ones_like
+    Parameters
+    ----------
+    model : tensor
+    dtype : data-type, optional
+
+    Returns
+    -------
+    tensor
+        tensor the shape of model containing ones of the type of dtype.
+    """
     if dtype is None:
         dtype = model.type.dtype
     ret = fill(model, constant(1.0, dtype=dtype))
@@ -2269,7 +2279,18 @@ def ones_like(model, dtype=None):
 
 @constructor
 def zeros_like(model, dtype=None):
-    """equivalent of numpy.zeros_like"""
+    """equivalent of numpy.zeros_like
+    Parameters
+    ----------
+    model : tensor
+    dtype : data-type, optional
+
+    Returns
+    -------
+    tensor
+        tensor the shape of model containing zeros of the type of dtype.
+    """
+
     if dtype is None:
         dtype = model.type.dtype
     return fill(model, constant(0.0, dtype=dtype))